81–90 of 135 posts
Yes, and I use that to take pictures of features below my as we fly from one place to the other.
If you have a iPhone, when you land, those pictures will be associated with the place you were when the photo was shot. This enables you to locate those curious features you happen to see.
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A person would have to have a quite flawed mental model of what GPS is to form the belief that it would stop working without data service, wouldn't they?
One of the interview questions where I work (we do automotive electronics) is "Explain how GPS works." It's directly relevant to the job, but it's also a neat opportunity to see how someone sizes up their audience, manages time and assumptions, etc. All those things are neat, but mostly what I've learned is that quite a lot of people, otherwise apparently reasonably smart and competent and toting a whole stack of pre…
> Have you ever noticed that your Maps app still works during a flight? I noticed the opposite, it always fails to locate any satellites, even when GPS is still turned on in aeroplane mode. I'm not sure why.
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So does this means that in recent days there wasn't GPS jamming but GPS satalites were broadcasting fake signals? In south Turkey people were appearing to be in Beirut airport. Also see this one: https://www.lloydslist.com/LL1148748/War-zone-GPS-jamming-se...
I'm having a hard time telling from the article - are the ships' GPSes actually reporting that they're at the airport? Or is the disconnect happening somewhere between GPS and AIS (eg they're intentionally transmitting bad location data- it's been common-ish in the past for ships to do this when doing something naughty (blockade running or illegal fishing) and given what's going on in the region I can see the value o…
I think it was due to Israel's some kind of defense measure against Iran.
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> You don't need to brute force the almanac - why would you? I have no idea, but the claim was that you get faster fix with brute force when I know that's not why it's fast in practice. > But it's very much feasible to 'brute force' your initial signal lock by searching for all gold codes at a range of frequency offsets. I hadn't even imagined this constituting "brute force". Is my phone using "brute force" to find t…
> I hadn't even imagined this constituting "brute force". Is my phone using "brute force" to find the WiFi router? Early receivers were a lot less advanced than modern receivers - one of the key functions of the almanac is to help receivers figure out what satellites they can expect to see - thus greatly reducing the range of gold codes and time offsets they have to check. Unlike wifi, GPS signals are below the noise…
Cool article. Whenever I see "from scratch," I'm always curious to see how from scratch the author actually means so I'll admit I was a bit disappointed to see that the hardware was just RTL-SDR. Still, the protocol decoding was very interesting and the result is great. > GPS was launched in 1978, which was 45 years ago at time of writing. Five billion people are currently under 40 years old, so well over half the wo…
> definitely useless for road navigation I would disagree strongly with this. I took a roadtrip in 1999 using a Delorme Earthmate Hyperformance GPS receiver, the RS-232 version, plugged into a Toughbook running Delorme Street Atlas USA, I believe it was version 6.0. It provided perfectly usable directions all the way across the country. It didn't do lane guidance (which I don't find terribly helpful anyway), but some…
I have one of these, but don’t really know how useful it is or what I can do with it, but like all of my random antique hardware, I don’t really have any good reason to part with it either.
Do you have any ideas for what to do with it?
For that matter, what is a good GPS unit in modern times?
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I did some brief searching of their Twitter feed and in general but couldn't find any update on this. Does anyone know the current state of passive radar and KrakenSDR? [1] https://www.rtl-sdr.com/sdrdue-updated-passive-radar-softwar... Comment thread from 2023-02-10: > We are attempting to clarify if it is legal for us (KrakenRF, a US company that provides a physical SDR product) to also provide our own open source…
The lawyer likely advised not talking about it more publicly. Almost any lawyer won't present the world as black and white, but rather in quantities of risk - and even saying "we've taken the project down and it wont be coming back" is a risk if that attracts attention to your past distribution of the software and causes others to mirror it from archives.
Additionally, it seemed like this page[1] (discussed previously[2]) details some reasons why some publicly visible source code projects should be able to include code that implements things otherwise under export control.
[1] https://www.unr.edu/sponsored-projects/compliance/export-con...
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> definitely useless for road navigation I would disagree strongly with this. I took a roadtrip in 1999 using a Delorme Earthmate Hyperformance GPS receiver, the RS-232 version, plugged into a Toughbook running Delorme Street Atlas USA, I believe it was version 6.0. It provided perfectly usable directions all the way across the country. It didn't do lane guidance (which I don't find terribly helpful anyway), but some…
> Delorme Earthmate Hyperformance GPS receiver, the RS-232 version I have one of these, but don’t really know how useful it is or what I can do with it, but like all of my random antique hardware, I don’t really have any good reason to part with it either. Do you have any ideas for what to do with it? For that matter, what is a good GPS unit in modern times?
These days, it depends on what you're doing with it, but it's hard to go wrong with this thing that claims to have a U-Blox 8-series chipset:
https://www.aliexpress.com/item/32816656706.html
Uniquely among such cheap receivers, that unit can even be configured to report raw data, and is thus the darling of the Galmon project for low-cost observers starting up. Also fun if you want to play with (single-band) RTK, etc.
(Dual-band has gotten "affordable", by which I mean "under a kilodollar", which is tremendous given where it was just a few years ago, but you'd probably know if you had a use for dual-band.)
What does a job have to do with publishing hobby projects?