While the eTrex unit is quite rugged, my biggest fear has always been of the screen getting scratched. Also I noticed that if you use a handle bar mount (see my other instructable) like the one I made, vibrations may cause the mount to rub against the body of the eTrex and cause scratch marks. ( I like my gadgets new and shiny :-) )
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2. A scissor
I used a 1.5Litre bottle of Coke as shown in the picture, the important thing to remember here is that the circumference of the bottle (measured around the lable) should be identical to the circumference of the eTrex measured along the length/vertically.
This will be more clear as we go along once you understand what it is I am trying to do....
Hope you have finished drinking that bottle by now because you need to empty it, wash it and dry it for the next step. Burp...
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Does this mean you have a camera, albeit a lousy one? If so, I would recommend taking pictures and posting them alongside the diagrams.
Also, since you apparently have an eTrex, I'll just ask you straight off: can the eTrex display your coordinates, does it use decimals or degrees, minutes, ad seconds, and how many decimal places/ seconds does it go to? I've seen plenty of images of the eTrex screen, but none show coordinates. I just want a GPS that will show me where I am, but no one advertises, "The CameronSS GPS--shows where you are, and nothing else!"