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45

This may be due to the long Time To First Fix. Indeed, I recently learned that recent smartphones use mechanisms called "Assisted GPS" in order to get a location based on GPS reception. The idea is that if you use your GPS in an area you haven't been before, the GPS would take some time to find and interpret the signal, mostly because of the slow download ...


31

Vince covers the likely explanation, but unfortunately there are several more sinister possibilities as well. Long story short, China's legislation on GPS is both really vague and in part secret: by some readings of the law all use of GPS devices is technically prohibited, and not a few cameras and other GPS-enabled devices go so far as to disable GPS ...


23

Yes, there's an app exactly for what you're looking for, and it's called Glympse. You can choose to share your location, set a timer on how long that location will be shared, and send the details (it's just a link) to any of your contacts via text message, Twitter, email, a bunch of other messaging apps etc. What I like about this is that you can limit ...


22

Unfortunately the plane body does an excellent job of blocking GPS signal. In general if you're in a window seat you will be able to get a signal by holding the GPS near the window (or, for example, on a tray table) - but if you're elsewhere on the plane it's very unlikely you'll get a signal. The exception to this may be the new Boeing 787, which is made ...


18

If you have a Nokia Symbian device, then you can get Ovi Maps installed on it. Ovi Maps allows you to download map files for as many countries as you want and store in on your memory card. Once that's done, you can set Ovi Maps to offline mode and still be able to use it to get directions. If you get a local SIM, then it will be able to show you rough ...


14

Yes, but the signal can be a bit weak. It's best to hold it to the window to get a lock. Depending on the GPS device, some are able to "hold onto the lock" even if they are not facing the window, so you only need to have it by the window for the initial lock. You may or may not be allowed to have it in the GPS. Here's my GPS while I was travelling near the ...


14

TomTom use "TeleAtlas" maps, and in fact they actually bought TeleAtlas several years ago. As with most mapping companies, TeleAtlas has varying levels of coverage for different countries. For countries like the US, TeleAtlas has near 100% coverage, which is to say that they have not just major highways, but all the way down to minor streets and even (in ...


14

A bit more searching and I've found Vesselfinder's QM2 page. Getting closer, I've found Crusein Me Ship Tracker, which looks promising... And The Cruse Village has a Live Ship Tracker:


13

Yes, Google Latitude! Ok, last year they merged it with google+, so now it's just under locations in that app, but it allows you to share your GPS location with other contacts or friends, on a pinpoint or city-wide location. It used to look like this: source But now, while still similar, is in Google+, and you can activate it as per the following ...


11

The difference sounds like a warm start vs a cold start. With a warm start, the GPS already knows Ephemeris data for at least 3 of the satellites above it. It can therefore kick straight off with solving the time signal equations, and can get a fix quickly. (That Ephemeris data could either come from having recently used the GPS, eg previous 4-6 hours, or ...


10

GPS devices do not have an active transmitter (for devices that don't go online to fetch map data, that is); they work by calculating time signals broadcast at low power by a constellation of satellites. Since there's no active transmitter and GPS signals are broadcast anyway (modern aircraft navigation systems do use GPS onboard), a watch or a camera ...


10

I am a (private) pilot, and have used my various GPS enabled devices for years both when I fly myself, as well as on commercial flights. (In the past, when they were not allowed, I applied for and obtained special permission from the airlines I was then flying.) Depending on the seat location, and position of the GPS satelite constellation, my reception ...


10

Yes, I did have GPS reception on my cellphone during a flight. However, it took quite a long time to get the initial coordinates, and I could not get updates on my location very often (the coordinates changed maybe once every 3-5 minutes). So I would say you would have bad reception in the best case. Maybe dedicated GPS devices would have a better antenna ...


10

If you and your follower both have iOS devices, Find My Friends can do what you are asking for.


9

FIrstly, even if you COULD get offline Google Maps, it's not that useful in non western countries. Murmansk - the largest city in the arctic circle, is shown as just two streets in Google Maps. Most of their coverage of Central Asia is next to useless as well. In addition, you need some serious storage for offline google maps. What I eventually settled ...


8

I don't know why there are no road maps of Iceland - but to answer the implied question of other ways of getting Iceland maps the following may be helpful. When I've needed navigation data for Iceland I've used Open Street Map, on a Garmin device. It looks like it should be possible to get them to work on a TomTom for more details see the TomTom page on ...


8

I've got a smartphone which can cache maps locally (it's a Nokia N900, but lots of other ones do that too, with a few notable exceptions). Before I go somewhere, on Wi-Fi I browse around the area I'll be visiting, so the phone downloads all the maps. When I'm there, I can then navigate around without needing to download anything, just using the cached maps ...


8

I tested this once on a flight which claimed it was fine, once you'd taken off, and not during landing - to use devices like this. I have an app on my phone (MyTracks) which is meant to track you when running, for example, but I just turned it on and left the phone running in my pocket. Not ideal for GPS, but I was in a window seat, giving it a slight ...


8

Many good answers here already. But I have been to China before, and used GPS with a very good precision, and with Google Maps. Also, dealing with the coordinates and mobile device GPS is part of my profession, so let me pitch in. GPS satellites are nothing more than a satellite network that spreads a signal of a timestamp that mobile phones or any GPS ...


7

Open Cycle Map provides a good coverage of Europe. On the GPS section, you can find a device recommendation suited for cycling, as well as how to put Open Street Maps on it.


7

Along with this question, you can get a Data Sim from O2 for GBP10 that offers 1GB of data. That should be enough for quite some time of navigation I would think, and it's cheaper than any of your listed alternatives. The additional advantage is that you will not have to pay for internet in the hotel or elsewhere to do your email or send some photos home. ...


7

There are many options for offline navigation on Android (tools that allow downloading maps and transforming your phone into a navigation assistant). The other answers suggested MapFactor or CoPilot GPS. There are another three free apps using openstreetmap data: Navit (a bit complicated to set up but maps are updated very frequently and you can download ...


6

WGS84 isn't a "format" at such, it's a "projection". Sometimes it's called a "Datum". Sometimes even a "coordinate system". All of those terms are pretty much correct. As it turns out, the world isn't flat. What's more, it's not even round, but instead some weird elliptical-like shape. Maps, on the other hand, are flat (unless you include those weird ...


6

A cheap unlocked Android phone with GPS (they start at $120 or so) plus a free offline maps app like RMaps. You don't need a data connection, but have the option of popping in a cheap local prepaid SIM card for calls and net access. Then you can use Mobile Atlas Creator 1.8 to download relevant maps from different sources before you go (or using a laptop ...


6

Addresses work similarly in Turkey to most countries, in that a postcode is a general area. The point that your sat nav is showing will likely be the centre of that postcode area. As Henning pointed out, however, that area may be quite large. Here in the UK, urban postcode areas are very small (a few houses) but out in the country they can take in a much ...


6

Long ago I took a fairly simple GPS (coordinates only, this was before the idea of a GPS with a map existed) to China--and found it couldn't cope with all the tall buildings. In a large park it would work. Once I managed to get a fix with it sitting on a windowsill high up in a building but at street level with buildings around I never got enough ...


5

Waze is free and pretty good. It relies on the community for constructing the maps so it's not as good as Google Maps, but it has a lot of users in Israel (it's an Israeli company) so it provides excellent coverage.



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