I strongly suggest to use your smartphone for tracking purpose. With MotionX you can also do liveupdates (when you have coverage).
With a smartphone you get a more "useful" track - which you can share - and others are able to drive the same way.
Livetracking from Satellite-Messenger allows with a "good" plan, to track any two minutes a waypoint - that is really just for showing where you was.. Is not usable for anything else...
With MotionX you can share your tracks in detail, too you can use it for a blog or something. With an GPX Export someone else can use it for navigation.
The Map is done with MotionX (the background is a Screenshot on my iPad):
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