Admittedly the car satnavs are much cheaper than the bike navs. The difference isn't only that the bike navs are (more) shockproof & waterproof than car navs. Placing the satnav into the tankbag will take care of that problem.
What is far more important is that the car systems are devised to take you on a more or less direct route to your goal. They usually do not offer the possibility to load pre-planned routes which you have worked out on your pc.
I often plan my routes on my home pc before the trip, using good maps that show scenic routes, and integrate this information into my route-planning.
@ ExtremeGene,
I don't quite agree with you regarding satnavs as pretty useless outside Europe. Thinking of Patagonia: Yes. There aren't many roads, so it is easy to drive by map. When travelling in South Africa this does not apply. There is a fairly dense road network - and few road signs on secondary roads. My gps came in very handy there :cool4:
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