GPS functionality with no service?

jent

macrumors 6502a
Original poster
Mar 31, 2010
695
147
I will be traveling in the Sahara Desert in the future in extremely remote areas with absolutely no cell signal or wifi signal. Would the GPS still work? Could I download an app with pre-cached maps in order to explore my current location and save my travel path? Or would the GPS not be able to determine my location? If not, why? Thanks for any input!
 

jent

macrumors 6502a
Original poster
Mar 31, 2010
695
147
It requires some type of connection to work.
This is incorrect. Just to be sure, I grabbed my 3G iPad and disabled wifi (and I've never used data on it so data was already disabled). Sure enough, the Maps app pinpointed me to my exact location when I tapped the location icon. Same thing with my iPhone. This works even if I take the micro-SIM card out. That being said, my original question still applies. Any thoughts?
 

-aggie-

macrumors P6
Jun 19, 2009
16,793
50
Where bunnies are welcome.
I will be traveling in the Sahara Desert in the future in extremely remote areas with absolutely no cell signal or wifi signal. Would the GPS still work? Could I download an app with pre-cached maps in order to explore my current location and save my travel path? Or would the GPS not be able to determine my location? If not, why? Thanks for any input!
Yes, the GPS doesn’t need a connection to work. The only problem is the maps can’t be used without a connection, but if you have pre-cached maps, everything will work fine.
 

jent

macrumors 6502a
Original poster
Mar 31, 2010
695
147
Yes, the GPS doesn’t need a connection to work. The only problem is the maps can’t be used without a connection, but if you have pre-cached maps, everything will work fine.
And GPS coverage is consistent across the world? Meaning, no matter where one is, he can get a GPS reception no matter what?
 

-aggie-

macrumors P6
Jun 19, 2009
16,793
50
Where bunnies are welcome.
And GPS coverage is consistent across the world? Meaning, no matter where one is, he can get a GPS reception no matter what?
I’ve seen people use iPhones in other parts of the world (Japan, for one), but I’d only be guessing if I said it works “everywhere.” Since it uses a satellite, I’d say yes, but that’s just an opinion.
 

Applejuiced

macrumors Westmere
Apr 16, 2008
40,650
6,404
At the iPhone hacks section.
And GPS coverage is consistent across the world? Meaning, no matter where one is, he can get a GPS reception no matter what?
Yes, you dont need cellphone service or data to use GPS.
GPS is free worldwide and with 24 GPS satellites operational in orbit you wont have a problem locking in within a minute or so. But like said above if you dont have a navigation or map program that has your locations maps stored locally on the phone then you'll see the dot but will have no idea where you're located or going.