message stringlengths 2 17.7k | message_type stringclasses 2
values | message_id int64 0 19 | conversation_id int64 0 1.03k |
|---|---|---|---|
I understand that unlocking the bootloader will wipe my Android phone, but have been looking around for why. Seems to be by design, but what is the reasoning for that design? Is it some security concern, some obscure technical reason, or just for lulz? I'm looking for something solid to chew on here, something more ... | instruction | 0 | 250 |
It's a security concern. The Android documentation doesn't provide a lot of elaboration, stating simply:
The procedure must be confirmed on-screen, and deletes the user data for privacy reasons.
However, the privacy concern is relatively straightforward to extrapolate. Once the bootloader is unlocked, the device ca... | output | 1 | 250 |
The original IBM PC and later variants used an Intel 8253 or 8254 as a sound chip. Why did users add sound cards such as the Adlib or Sound Blaster. I remember voice output with programs like telephone answering programs. The sound was wimpy but I attributed most of the quality to speaker size.
What was lacking with th... | instruction | 0 | 251 |
> The original IBM PC and later variants used an Intel 8253 or 8254 as a sound chip.
The 8253 is a timer circuit, containing three timers able to generate timed interrupts or square-wave output with programmed frequencies. On the PC the third timer's output is, via an amplifier, connected to a simple speaker.
As said... | output | 1 | 251 |
According to the sources I have found, a lambda expression is essentially implemented by the compiler creating a class with overloaded function call operator and the referenced variables as members. This suggests that the size of lambda expressions varies, and given enough references variables that size can be arbitrar... | instruction | 0 | 252 |
The implementation of ```std::function``` can differ from one implementation to another, but the core idea is that it uses type-erasure. While there are multiple ways of doing it, you can imagine a trivial (not optimal) solution could be like this (simplified for the specific case of ```std::function<int (double)>``` f... | output | 1 | 252 |
So, I'm on vacation in Utah, and so I attended an LDS service. In the morning, I heard a reading from one of the Presidents of the church during the "Quorum of the Elders," then went to Sunday School, and finally witnessed the Sacrement of the bread and water. (I guess it makes sense there was no wine, but it did make ... | instruction | 0 | 253 |
Mormon services are a bit different, as you discovered. In the United States, there is generally a block of 3 meetings back-to-back including a sunday school, a mens' and women's time for instruction, and a sacrament meeting where the general congregation meets together. It sounds like the first meeting you attended wa... | output | 1 | 253 |
A partir de un String, ```"123-654321"```, lo que deseo es dividirlo en dos Strings:
```string1=123
string2=654321
``` | instruction | 0 | 254 |
Tres formas diferentes de hacerlo:
1. Utilizando la función ```String.split()``` :
``` String str = "123-654321";
String[] parts = str.split("-");
```
Esta solución utiliza expresiones regulares, así que no es lo más eficiente si no estas trabajando con ellas.
2. Utilizando la clase ```StringTokenizer``` :
```static ... | output | 1 | 254 |
What’s the difference between ```\n``` (newline) and ```\r``` (carriage return)?
In particular, are there any practical differences between ```\n``` and ```\r```? Are there places where one should be used instead of the other? | instruction | 0 | 255 |
In terms of ascii code, it's 3 -- since they're 10 and 13 respectively.
But seriously, there are many differences:
* in Unix and all Unix-like systems, ```\n``` is the code for end-of-line, ```\r``` means nothing special
* as a consequence, in C and most languages that somehow copy it (even remotely), ```\n``` is the ... | output | 1 | 255 |
Assume that I am a programmer and I have an NP-complete problem that I need to solve it. What methods are available to deal with NPC problems? Is there a survey or something similar on this topic? | instruction | 0 | 256 |
There are a number of well-studied strategies; which is best in your application depends on circumstance.
* Improve worst case runtime
Using problem-specific insight, you can often improve the naive algorithm. For instance, there are $O(c^n)$ algorithms for Vertex Cover with $c huge improvement over the naive $\Omega(... | output | 1 | 256 |
Why are the lights inside commercial airplanes turned off during take off and landing? | instruction | 0 | 257 |
This is for safety reasons.
Take-off and landing are the two most critical phases of flight and thus, every additional step to ensure survivability, be it even just adjusting the light, is taken.
The interior lights or cabin lights are adjusted to match the exterior environment, so that in case of an emergency, espe... | output | 1 | 257 |
The default behaviour of ```LIKE``` and the other comparison operators, ```=``` etc is case-sensitive.
Is it possible make them case-insensitive? | instruction | 0 | 258 |
There are 3 main ways to perform a case-insensitive search in Oracle without using full-text indexes.
Ultimately what method you choose is dependent on your individual circumstances; the main thing to remember is that to improve performance you must index correctly for case-insensitive searching.
1. Case your column ... | output | 1 | 258 |
I have a new SPA with a stateless authentication model using JWT. I am often asked to refer OAuth for authentication flows like asking me to send 'Bearer tokens' for every request instead of a simple token header but I do think that OAuth is a lot more complex than a simple JWT based authentication. What are the main d... | instruction | 0 | 259 |
TL;DR If you have very simple scenarios, like a single client application, a single API then it might not pay off to go OAuth 2.0. On the other hand, if there are lots of different clients (browser-based, native mobile, server-side, etc) then sticking to OAuth 2.0 rules might make it more manageable than trying to roll... | output | 1 | 259 |
Gostaria de saber se existe alguma forma simples de realizar um upload de arquivos via AJAX + JSON.
Se houver, qual seria? | instruction | 0 | 260 |
Você pode fazer uploads de arquivos utilizando o método ```POST``` porém deve incluir o FormData com a propriedade ```enctype``` definida como ```multipart/form-data``` para que seus arquivos sejam enviados na requisição.
Contudo, a formatação do envio não vai ser um JSON, mas sim no ```enctype``` que você definir no s... | output | 1 | 260 |
Did the ancients or other pre-industrial civilisations engage in unsustainable practices? | instruction | 0 | 261 |
Most ancient agricultural practices deplete soil to some degree, but are just fine when population does not exceed certain limits. There are some examples of ancient cultures exhausting natural resources available to them - Pitcairn Island Polynesians, Ancient Puebloans (Anasazi). It's the cause of the semi-nomadic way... | output | 1 | 261 |
When reading my Bible, I've noticed Joesph's name listed in both the Old and New Testaments; is it the same person or is there more than one Joseph in the Bible? | instruction | 0 | 262 |
There are 3 distinct (fairly) well-known Josephs in the Bible, firstly in the Old Testament (mainly):
* Joseph the son of Jacob/Israel (aka The Patriarch Joseph). This Joseph is actually referred to in a few select places in the New Testament: John 4:5; Acts 7:9-18; Hebrews 11:21-22 & Revelation 7:8.
However, it's mo... | output | 1 | 262 |
Para que serve o "with" no Python? | instruction | 0 | 263 |
Ele é usado para garantir finalização de recursos adquiridos.
Um arquivo, por exemplo é aberto. Quem garante que ele será fechado? Mesmo que você coloque no código de forma explícita que ele deve ser fechado, se ocorrer uma exceção, o código sai de escopo sem executar o resto do código que está em escopo, ele pula o f... | output | 1 | 263 |
The question bothers me since February 2022. Why (legally) are Russian combatants in Ukraine considered soldiers (thus POWs when captured) rather than terrorists?
* There is no formal declaration of war.
* They are members an organization (Russian military) that commits acts of terrors to civilian population in clea... | instruction | 0 | 264 |
The third Geneva convention says in its second article (emphasis added):
> the present Convention shall apply to all cases of declared war or of any other armed conflict which may arise between two or more of the High Contracting Parties, even if the state of war is not recognized by one of them.
> The Convention shall... | output | 1 | 264 |
What are the major branches of philosophy? | instruction | 0 | 265 |
The traditional branches of philosophy generally include
* Aesthetics
* Epistemology
* Ethics
* Logic
* Metaphysics / Ontology
We can go ahead and add a few contemporary branches on to this (more examples could certainly be adduced):
* Philosophy of Science [referring to the hard sciences] (Mathematics, Technology, e... | output | 1 | 265 |
Are there any advantages while backpacking to hike during the night and sleep during the day? | instruction | 0 | 266 |
There are several reasons, though not all of them would apply for one's usual holiday trip.
1. Remaining unseen: Obviously, during night its dark and this gives you a fair bit of cover if you want to remain unseen. This reason for traveling at night is common for many hunters in the animal kingdom (and sometimes also ... | output | 1 | 266 |
I have been cautioned against blending:
* Traditional fantasy elements
Such as magic systems and exotic, less plausible creatures (on a scientific level - magic tends to explain away these beasts)
* Traditional sci-fi elements
Such as advanced technology and civilizations amidst the stars.
I have taken it upon myse... | instruction | 0 | 267 |
Any sufficiently advanced technology is indistinguishable from magic.
- Arthur C Clarke
There's a reason that science fiction and fantasy are frequently shelved together - separating the two is usually a fools errand.
The Dragonriders of Pern features a preindustrial society where flying, firebreathing, teleporti... | output | 1 | 267 |
Why are prions in animal diets not destroyed by the digestive system? | instruction | 0 | 268 |
Proteases are enzymes in your digestive system that help break down food, acting like molecular-sized scissors that cut up proteins.
Proteases have clefts, or subpockets, into which proteins fit, where the substrate (protein) gets cut.
Infectious or pathogenic prions are resistant to proteases, because of their three... | output | 1 | 268 |
How slicing in Python works? Please include references where appropriate. | instruction | 0 | 269 |
The syntax is:
```
a[start:stop] # items start through stop-1
a[start:] # items start through the rest of the array
a[:stop] # items from the beginning through stop-1
a[:] # a copy of the whole array
```
There is also the `step` value, which can be used with any of the above:
```
a[start:stop:st... | output | 1 | 269 |
I am writing a story where a species undergoes devolution. Is there any scientific or plausible way to do this? The process can be instantaneous or may take ages, I do not mind which as I need to weigh my options at this stage.
To be clear, the devolution I am thinking of is like taking a human being then devolving hi... | instruction | 0 | 270 |
Devolution doesn't really ever occur, organisms simply adapt to best suit their environment over time. A good example is cave dwelling Troglodyte type species that have lost the ability to see. They haven't actually devolved to not have eyes, they simply did not need them and evolved to save valuable energy and nutrien... | output | 1 | 270 |
I've used GEDCOM to transfer data between desktop software and websites, but it all seems a bit old hat. Is there anything better that will mangle* my data less.
* For example, GEDCOM can lose some data where the two ends of the system understand a concept which GEDCOM does not have a field for. | instruction | 0 | 271 |
GEDCOM is the defacto standard for exchanging genealogical data. There are some problems with GEDCOM.
* It is not rich enough to hold all the types of information that different vendor systems manage internally. So exporting GEDCOM from one system may lose information that that system actually holds. Though see point ... | output | 1 | 271 |
Is it ever possible that ```(a== 1 && a ==2 && a==3)``` could evaluate to true in JavaScript? | instruction | 0 | 272 |
If you take advantage of how == works, you could simply create an object with a custom ```toString``` (or ```valueOf```) function that changes what it returns each time it is used such that it satisfies all three conditions.
```
const a = {
i: 1,
toString: function () {
return a.i++;
}
}
if(a == 1 && a == 2 ... | output | 1 | 272 |
Gostaria de saber qual é a real diferença entre o ```String``` (s maiúsculo) e o ```string``` (s minúsculo).
Aparentemente os dois têm os mesmos objetivos, porém qual é "melhor" para ser utilizado? | instruction | 0 | 273 |
Já foi dito que ```string``` é apenas um alias para o tipo ```String```.
Para deixar claro, não há diferença em performance ou forma como o código é gerado. Há exatamente zero diferença no tratamento de ambas. Elas podem fazer as mesmas coisas, e todos os membros estão disponíveis em qualquer um deles, afinal assim se ... | output | 1 | 273 |
I'm working on a project solo and have to maintain my own code. Usually code review is done not by the code author, so the reviewer can look at the code with the fresh eyes — however, I don't have such luxury. What practices can I employ to more effectively review my own code? | instruction | 0 | 274 |
First of all, make use of tools to check as much as you can. Tests (backed up with some reasonable code coverage) will give you some confidence of the correctness of the code. Static analysis tools can catch a lot of best practice things. There will always be issues that you need human eyes on to determine though and y... | output | 1 | 274 |
Assume an environment with a puppet-managed cluster of different servers - various hardware, software, operating systems, virtual/dedicated, etc.
Would you choose meaningful hostnames (mysqlmaster01..99, mysqlslave001..999, vpnprimary, vpnbackup, etc.) or would you prefer meaningless hostnames such as characters from a... | instruction | 0 | 275 |
This largely comes down to whether your servers are ```pets``` or ```livestock```.
Pets get individual names. They're distinct from each other, and we care about those differences. When one gets sick, we usually try to nurse it back to health. Traditionally, servers have been pets.
Livestock get numbers. They're most... | output | 1 | 275 |
Best way to start investing, for a young person just starting their career? | instruction | 0 | 276 |
First off, I highly recommend the book Get a Financial Life. The basics of personal finance and money management are pretty straightforward, and this book does a great job with it. It is very light reading, and it really geared for the young person starting their career.
Now, with that out of the way, there's really ... | output | 1 | 276 |
Quantum state teleportation is the quantum information protocol where a qubit is transferred between two parties using an initial shared entangled state, Bell measurement, classical communication and local rotation. Apparently, there is also something called quantum gate teleportation.
What is quantum gate teleportatio... | instruction | 0 | 277 |
Quantum gate teleportation is the act of being able to apply a quantum gate on the unknown state while it is being teleported. This is one of the ways in which measurement-based computation can be described using graph states.
Usually, teleportation works by having an unknown quantum state $|\psi\rangle$ held by Alice... | output | 1 | 277 |
What does it mean for an album to be remastered? | instruction | 0 | 278 |
Mastering is a separate art from recording or mixing. According to the Wikipedia article, the principle processes of mastering are:
* Editing minor flaws.
* Applying noise reduction to eliminate clicks, dropouts, hum and hiss.
* Adjusting stereo width.
* Adding ambience.
* Equalize audio across tracks for the purpose ... | output | 1 | 278 |
What's the best way to iterate over the items in a ```HashMap```? | instruction | 0 | 279 |
Extracted from the reference How to Iterate Over a Map in Java:
There are several ways of iterating over a ```Map``` in Java. Let's go over the most common methods and review their advantages and disadvantages. Since all maps in Java implement the Map interface, the following techniques will work for any map implementa... | output | 1 | 279 |
Why did people start using CO2 (instead of e.g. oxygen) for carbonated drinks? | instruction | 0 | 280 |
CO2 tastes good! Carbonated water is actually a weak carbonic acid solution; this is what you taste. It's like "salt and pepper", but for water.
Slightly acidic water is usually popular, hence lemon juice is sometimes used to taint a jug of water in times when no carbonated water is available.
Carbonated water releas... | output | 1 | 280 |
Say I have a file ```/templates/apple``` and I want to
* put it in two different places and then
* remove the original.
So, ```/templates/apple``` will be copied to ```/templates/used``` AND ```/templates/inuse```
and then after that I’d like to remove the original.
Is ```cp``` the best way to do this, followed by ``... | instruction | 0 | 281 |
You are using ```|``` (pipe) to direct the output of a command into another command. What you are looking for is ```&&``` operator to execute the next command only if the previous one succeeded:
```cp /templates/apple /templates/used && cp /templates/apple /templates/inuse && rm /templates/apple
```
Or
```cp /template... | output | 1 | 281 |
When are Decision Diagrams the right way to model and solve a problem? | instruction | 0 | 282 |
Decision diagrams (DDs) are most effective when they can compactly represent a large (perhaps exponential) set of solutions. This is done by merging equivalent states in each layer. To make decision diagrams scalable, we can use relaxed decision diagrams which allow merging nodes that are not necessarily equivalent. Re... | output | 1 | 282 |
Essentially, I have a protagonist who I set up as a 'main' good guy in one of my series. However, in my final series, I intend to make him turn to the dark side and oppose my other protagonists (from my other series). It's clear in his series that the protagonist-turned-antagonist is very devious, and he has had hostil... | instruction | 0 | 283 |
Sounds like a great idea!
Seriously though: the antagonist is the single most important character to any plot. The very best antagonists have motivations and feelings that readers can understand and empathize with. A former protagonist as an antagonist sounds really good. Both the reader and the author should be in fo... | output | 1 | 283 |
I'd never heard of anycast until a few seconds ago when I read "What are some cool or useful server/networking tricks?".
The wikipedia "Anycast" article on it is quite formal and doesn't really evoke a mental picture of how it would be used.
Can someone explain in a few informal sentences what "anycast" is, how you con... | instruction | 0 | 284 |
Anycast is networking technique where the same IP prefix is advertised from multiple locations. The network then decides which location to route a user request to, based on routing protocol costs and possibly the 'health' of the advertising servers.
There are several benefits to anycast. First, in steady state, users ... | output | 1 | 284 |
$A$ and $B$ are $n \times n$ matrices and $v$ is a vector with $n$ elements. $Av$ has $\approx 2n^2$ flops and $A+B$ has $n^2$ flops. Following this logic, $(A+B)v$ should be faster than $Av+Bv$.
Yet, when I run the following code in matlab
```A = rand(2000,2000);
B = rand(2000,2000);
v = rand(2000,1);
tic
D=zeros(size... | instruction | 0 | 285 |
Except for code which does a significant number of floating-point operations on data that are held in cache, most floating-point intensive code is performance limited by memory bandwidth and cache capacity rather than by flops.
$v$ and the products $Av$ and $Bv$ are all vectors of length 2000 (16K bytes in double preci... | output | 1 | 285 |
I came across a piece of code ```void *p = &&abc;```. What is the significance of ```&&``` here?
I know about rvalue references but I think ```&&``` used in this context is different. What does ```&&``` indicate in ```void *p = &&abc;``` ? | instruction | 0 | 286 |
## How to find it out
That's the address of a label and it's a feature specific to GCC.
```int main(void) {
void* startp;
s:
startp = &&s;
printf("the assignment above starts at address %p\n", startp);
return 0;
}
```
You could have figured it out yourself by testing:
```int main(void) {
... | output | 1 | 286 |
When I execute "```python```" from the terminal with no arguments it brings up the Python interactive shell.
When I execute "```cat | python```" from the terminal it doesn't launch the interactive mode. Somehow, without getting any input, it has detected that it is connected to a pipe.
How would I do a similar detectio... | instruction | 0 | 287 |
You can use ```isatty```:
```
#include <stdio.h>
#include <io.h>
...
if (isatty(fileno(stdin)))
printf( "stdin is a terminal\n" );
else
printf( "stdin is a file or a pipe\n");
```
On windows they're prefixed with underscores: ```_isatty```, ```_fileno```. | output | 1 | 287 |
"The video of Pythom Space's first rocket test has raised a few eyebrows
The video prompted hundreds of replies on Twitter, including some from rather horrified rocket scientists. "We knew better as untrained college students," said Jordan Noone, the co-founder of Relativity Space.
Pythom “Micro jump”
What ... | instruction | 0 | 288 |
The easy-to-spot stuff:
* (assumed) Improper transportation of hazardous materials. Both white fuming nitric acid and furfuryl alcohol are considered hazardous materials; none of the vehicles in the video appears to have a hazmat placard, the rocket is not an approved hazmat container, and the fuel containers seen in... | output | 1 | 288 |
When should I use wp_register_script() with wp_enqueue_script() vs just wp_enqueue_script()? | instruction | 0 | 289 |
The ```wp_register_script()``` Codex page literally says:
A safe way of registering javascripts in WordPress for later use with ```wp_enqueue_script()```.
This means, if you want to register your scripts, but not directly load them in your pages, you can register the files once, and then load them when you need the... | output | 1 | 289 |
When encoding a logic into a proof assistant such as Coq or Isabelle, a choice needs to be made between using a shallow and a deep embedding. In a shallow embedding logical formulas are written directly in the logic of the theorem prover, whereas in a deep embedding logical formulas are represented as a datatype.
* W... | instruction | 0 | 290 |
> What are the advantages and limitations of the various approaches?
* Pros of deep embeddings : You can prove and define things by induction on formulas' structure. Examples of interests are the size of a formula.
* Cons of deep embeddings: You have do deal explicitly with binding of variables. That's usually very l... | output | 1 | 290 |
Prove that the union of countably many countable sets is countable. | instruction | 0 | 291 |
Let's start with a quick review of "countable". A set is countable if we can set up a 1-1 correspondence between the set and the natural numbers. As an example, let's take $\mathbb{Z}$, which consists of all the integers. Is $\mathbb Z$ countable?
It may seem uncountable if you pick a naive correspondence, say $1 \map... | output | 1 | 291 |
Você encontra na internet a afirmação que Singletons são ruins. Isto é verdade? Por quê?
O problema seria generalizado para quaisquer objetos com instância única? Ou para qualquer coisa que tenha estado global?
Se é tão ruim, pra que foi inventado? Ou seja, que problema ele queria resolver?
Quais os problemas que terei... | instruction | 0 | 292 |
Muito da polêmica ocorre pela falta de uma contextualização. Não vejo nada que desabone o padrão Sigleton quando usado no contexto correto. Sim, ele pode causar muito mal, assim como qualquer padrão de projeto aplicado indevidamente sem análise do impacto e dos efeitos colaterais.
###Porque não usar
* Acoplamento. Ao ... | output | 1 | 292 |
The construction of Solomon's temple includes a piece of furnishing described in 1 Kings 7:23 (ESV):
Then he made the sea of cast metal. It was round, ten cubits from brim to brim, and five cubits high, and a line of thirty cubits measured its circumference.
So if the ```diameter = 10``` cubits and the ```circumfer... | instruction | 0 | 293 |
To start with, compare the circle the diameter we're given would make with the circle the circumference we're given would make:
Since a circumference is π times the diameter, a 'pure' circle of 10 cubits in diameter as we describe the sea as having would be 10π cubits in circumference, or roughly 31.4 cubits.
Now, si... | output | 1 | 293 |
With PHP 7.2, ```each``` is deprecated. The documentation says:
Warning This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged.
How can I update my code to avoid using it? Here are some examples:
*
```$ar = $o->me;
reset($ar);
list($typ, $val) = each($ar);
```
*
```$out ... | instruction | 0 | 294 |
* For your first two example cases, you could use ```key()``` and ```current()``` to assign the values you need.
```$ar = $o->me; // reset isn't necessary, since you just created the array
$typ = key($ar);
$val = current($ar);
```
*
```$out = array('me' => array(), 'mytype' => 2, '_php_class' => null);
$expected =... | output | 1 | 294 |
Can someone please give an explanation of different egg preparations? | instruction | 0 | 295 |
Sure, here are different preparations of eggs:
1. Fried Eggs:
* Sunny Side Up -- Not flipped, unbroken yolk. The top of the egg is just barely set.
* Basted -- Sunny Side Up, hot fat spooned over until the white surrounding the yolk is opaque.
* Over Easy / lite -- Flipped, whites fully cooked, unbroken yolk, yolk r... | output | 1 | 295 |
I'm running a relatively small one-man business in the software sector. I just started and am trying to create a larger portfolio. For that, I offer some friends free services.
I found a few reasons to send these clients €0,- invoices, mostly similar to the reasons to send 100% discount invoices to charity funds that ... | instruction | 0 | 296 |
It depends on the tax system that applies to you, but there can be consequences, and they can be very severe.
Generally economic activity is defined as oriented on profit, so giving anything for free could qualify as self-promotion or donation.
In Poland, for example, only some costs of the company spend on promotion... | output | 1 | 296 |
In regards to Error handling in PHP -- As far I know there are 3 styles:
* ```die()```or ```exit()``` style:
```$con = mysql_connect("localhost","root","password");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
```
* ```throw Exception``` style:
``` if (!function_exists('curl_init')) {
throw new Ex... | instruction | 0 | 297 |
The first one should never be used in production code, since it's transporting information irrelevant to end-users (a user can't do anything about "Cannot connect to database").
You throw Exceptions if you know that at a certain critical code point, your application can fail and you want your code to recover across mu... | output | 1 | 297 |
How do I change the author and committer name/email for multiple commits? | instruction | 0 | 298 |
Here is the solution, but be careful if you have a multi-user repository - this will change all commits to have the same (new) author and committer.
```
git filter-branch -f --env-filter "
GIT_AUTHOR_NAME='Newname'
GIT_AUTHOR_EMAIL='new@email'
GIT_COMMITTER_NAME='Newname'
GIT_COMMITTER_EMAIL='new@email'... | output | 1 | 298 |
This summer I will be taking a rather inherently dangerous multi-day hike by myself. I was considering buying a flare gun since I will be out of cellular range unless there is something more modern and equally reliable. Any suggestions? | instruction | 0 | 299 |
In increasing order of complexity and price you have,
* Personal Locator Beacons
Personal locator beacons are high-powered (typically, 5 watts) devices designed primarily to send out a personalized emergency distress signal. They generally require an open view of the sky to transmit successfully.
* Satellite Messe... | output | 1 | 299 |
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