Let's hear it for Velcro!!
If you like to drive with a bunch of gizmos activated, you probably don't like to have them diving onto the floor every time you make a turn. I've solved the problem for the cell phone, ham radio, and Geiger counter:
good old Velcro.
Each of these items has a strip of velcro "loop" on the back, like this on the back of the phone (one on each battery):
And on the dash there is a long strip of velcro "hook" visible here between two gizmos:
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