I found the program GT for Symbian devices on the net.
Check this link:
http://www.tempes.com/
Sounds very suitable for Geocaching because it also refers to it on there homepage:
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Do you need GT?
* Tuning your car? Did product X improve performance? Use GT to find out!
* Why is everyone overtaking you? Is your speedometer inaccurate? Use GT to find out!
* How to find back to the hotel? Use GT to find places again!
* Geocaching? GT is all you need!
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I installed it and will try it during the next days.
Regards
Geraner