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i've got a situation where i have no instruments (guages or speed sensor) to determine my speed. when i'm trolling umbrella rigs, i'm usually guessing on the speed. sometimes i catch them sometimes i don't. i'll somewhat determine the speed by dropping the umbrella rig into the water and keeping it within sight(usually a few feet behingd the boat). then i'll play with the speed to determine how fast or how slow to troll. is there an easier way to find out how fast i'm trolling?
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