Just a heads up though. Disabling GPS will only improve your battery life when you are using apps that use your location (fine). Location (coarse) programs (like weather apps, for example) won't be effected.
The only thing disabling the GPS does is disables Location (fine). This is for apps like maps, navigation, geocaching, etc. You will know when Location (fine) is on when you see the little satellite dish with green lines. This is the ONLY time that the GPS chip is active and using power.
So it won't make a huge impact. Just thought you should know