Weems & Plath Bi-Rola Ruler plotter #155 An incredibly simple tool to use. It is a straight ruler, with protractor markings and a swivel arm that can be mounted on either end. The swivel arm can be used to correct for compass error, or as a caliper to measure distance. The real beauty is that the ruler has vertical and horizontal rollers in it that allow you to move a specific bearing from anywhere on your chart to anywhere on your chart. I have found that there is little to no walk, even after moving a bearing across the chart several times. The most common use for kayakers would be this: Place the ruler along a course you'd like to plot, and roll the ruler vertically and horizontally as needed until it lies across a compass rose on the chart. Take a reading off the rose, and you have your bearings for both outgoing and returning! Distance is measured by opening the swing arm to cover the distance you want to measure, and then lay it against the latitude lines on your chart. Each minute of latitude is a nautical mile. Can't be any simpler. It does require a relatively flat surface to work well, but that's the only downside I've found. Cost was $32. Ruler is made of Lexan (Which is all but indestructible), and the rollers are brass. If you're into paddling where navigation is a consideration, you'll find this to be a great little plotter. -------------------------------------------------------------------------- ------ Wayne Smith wsmith16_at_snet.net Check out my sea kayaking & homebrewing page: http://pages.cthome.net/wsmith16/home.html *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed Apr 11 2001 - 14:57:24 PDT
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