NTP requires network and has
firewall/proxy/server-side issues.
.
Use your GPS !
It works, even in the most remote place you can find.
It doesn't require you to have gprs or wifi access.
It doesn't need firewall pinholes or proxies.
And it does it very nicely.

GPS Recorder
GPS track logger to KML, GPX and/or CSV formats
Yet another GPS track logger.
Main features :
* Gathers as much information as possible from the GPS subsystem at a desired frequency (time, satellites, fix loss, etc...).
* Exports your saved tracks to KML/KMZ, GPX and/or CSV files in a single operation.
* Snap and name a position (POI) while recording to see it later on a map.

* Automatically updates system time according to GPS time.

Homepage:
http://gpsrecorder.jcl.name/
Section:
user/navigation
Maintainers:
Jean-Charles Lefebvre

Check it out:
http://maemo.org/packages/view/gpsrecorder/