Disable "cellphone" to save battery

[karstenk]

Hi

I'm having a Sony X8 with Android 2.1.

I use it to track my bicycle rides, so the GPS is essential. But I don't need the phone-part of the phone when riding. I hope you understand me, I don't want to talk to anybody on the phone anyway, do I usually mute the phone.
Is it possible to turn the "cell phone-feature" off and still be able to use the GPS?

I tried airplane mode, but the GPS seems to be too inaccurate when in airplane mode.

 

[Davdi]

I think (Not 100% certain) that the navigation software can also use cell-towers to triangulate an approximate locatrion. If that's true, best to leave the phone as a phone and mute it.