his mounting bracket has all the qualities you're looking for: lightweight, portable, adjustable. Bracket is jointed, allowing you to position your GPS out of the sun's glare. Comes with temporary and permanent adhesive disks that adhere the mount base to the dash.
Adhesive Automotive Mount, May 07, 2007
Reviewer:
Leland
Excellent product, monunted it on my bass boast and stays very secured. Rough water and speed doesn't bother this piece of equipment at all.