Here's my solution, although I can only afford a 296.  I put a big wide 
strip of some industrial strenght velcro on the back of the unit and 
another on the right "glove box" door.  I don't know how many g's it 
can pull but it would be significant.  However, I usually just lay the 
unit out of the sunlight in the right seat or on my lap so I can see 
the screen better.
Electrics are handled by installing a cigarette lighter socket, 
legally, and using the lighter plug provided with the GPS unit.
P.S.
Don't wet your finger and stick it in the lighter socket.
Bart 


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