There's a not so simple math formula you can use to figure out your depth. You need to know the angle of the line to the water, length of line from rod tip to lure and height of rod tip above the water to calculate (I had the formula somewhere when I was messing with my downrigger depths but can't find it). Any math guys on the board?
Note: you won't get an EXACT depth because of the arc in the line once it hits the water but it'll be so damn close that the difference won't really matter.
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