Originally intended to stick some pics here as well - Anyone care to enlighten me as to how to do it? - Ta.
...In the meantime, use your imagination.
I made a nifty little holder constructed from plastic electrical control panel trunking (Also avail in Black - but we don't have that <sigh>). Total construction time from first cut to completion was 15min with nothing more than a hacksaw, pliers, and pop riveter. I wanted something reasonably elegant and non destructive to the car, whilst being easy to see and allowing the unit to get a good look at the sky. Adept scroungers can probably talk 6" of the stuff out of even the hardest industrial electrician
Photos show two separate mounts in different cars. The Yellow Peril (ETrex) also fits this one, but why not create a custom mount especially for it. Note the plier-tweaked lugs at the bottom to stop the GPS from bashing your ankles (Pic1). Hose clips or cable ties can also be easily attached to allow mounting to bikes, parachutes, kites, dogs etc....
*** Edited to insert photo's ***