Velcro sounds like a good idea. I smeared some silcon on the inside of the holder to improve fit, then I use a loop cut from inner tube to secure it. I use similar loops to secure the power lead to the gps (1/2 hitch on the cable), and at the other end, to the power socket.
Originally Posted by Cruz
I use a stip of self adhesive velcro in the cradle and also on the rear of my Oregon to help keep it in place. Does not move a bit now and you have to 'tear' it off the velcro to remove from the cradle. Not sure on the design or shape of your cradle though.