GPS start up

jimjiminyjimjim · **Joined:** Fri Jan 20, 2012 9:52 am **Posts:** 22

I'm trying to use the GPS features of the 3G shield.

Ultimately I'd prefer to use the standalone feature.

The main problem is knowing when the device has a lock on the GPS positions. On reading the AT command manual there seems to be two startup routines:

AT+CGPSCOLD

AT+CGPSHOT

what are the differences between these two routines? Also - is there a way to get a notification when the GPS has got a location? Or do you just have to keep sending the AT command until it doesn't return ,,,,,

Thanks

libelium-dev · **Joined:** Mon Sep 28, 2009 11:06 am **Posts:** 2209

Hello jimiminyjimjim,

You're right

You have to keep sending the AT command until it doesn't returns ,,,,, If you want to get a notification when the GPS has got a location.

About the functions:

AT+CGPSCOLD The command is used to cold start GPS session. When is the first time you start the session.

AT+CGPSHOT The command is used to hot start GPS session. When you have connected recently. Theoretically would be less time synchronization.

Regards.