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Signing UpStep 1: Bill of Materials
1 3"-4" 90 Angle Bracket
2 1/4" x 20 Machine Screws
2 Lock Washers
2 1/4" x 20 Wing Nuts
About a foot of tent pole shock cord
Stickyback Velcro the size of your GPS (industrial is best)
Not Pictured: 2 Zipties
Tools:
1 Black Dry Erase Marker
Cutting Tool such as Dremel or Hot Knife
Drill
1/4" Metal Drilling Bit
Scissors
Optional: Removable Thread Lock











































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Check out more info on IP ratings: http://www.aquatext.com/tables/ip_ratings.htm
For about 9 feet of accuracy, $100 - $200 isn' t too bad. Where I work we sell units that are accurate to the size of a dime.... they cost about 50k though.
You can usually find deals in the want ads for units that are older... they still should work.