Hi,
Get the Garmin vehicle mount for the etrex, mount it on the dash close to windscreen - It will work fine -(unless you have a front heated screen)
Use emails, fax's to communicate, unless you are spending lots of time in remote deserts, save the money from the sat phone and spend it on your trip - the money is a good few extra weeks on the road doing what you probably wanted to do in the first place...getting away from it all.
It wont be as difficult as you expect and there are nearly always people about to help if you have problems.
Have a good Trip
Cheers
Grif
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