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Here are a couple of other suggestions:

1) Get or borrow a good handheld GPS to determine your trolling speed. Somewhere between 1 and 3 mph is usable. Just remember that some GPS's are not very accurate at very slow speeds...

2) Buy the "Precision Trolling" book from http://www.precisionangling.com/ This book contains information about where your lure will be depending on the type, trolling speed and how much line is out. Check out http://www.precisionangling.com/curve.html for an example page from the book.

Hope this helps.
 

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roadkill said:
Just remember that some GPS's are not very accurate at those slow speeds
could you state your source for this

ever since SA was turned off GPS accuracy is quite impressive even with the cheep (under $100) units i used to have trouble with an old 2 channel units while traveling faster than 200 mph especialy when changing directin quickly havent been up in a few years but most units are 12 parrallel chanell and do quite well
I will look it up, but as I recall it had to do with the amount of internal averaging some of the GPS's would do... I know that, even with SA off, my fishfinder's GPS gives very strange and inconsistent readings below 1mph, for example.
 
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