That will not determine trolling speed. That is maximum efficent speed for the hull, right? That is for sailing.
Without a GPS, I would do what JAVeil suggested. Put the lure in the water where you can see it. Get it working right and let the line out. Of course, when you change directions to wind and current, that lure action may change. So also look at the tip of your rod to get that rod tip action working right. Even, with a GPS, that is speed over bottom, trolling speed may vary. Current will possibly make the lure work differently. There tends to be a range that the lure will work within. In any event, during a day of trolling, you should change speeds occasionally, to dial in the right speed.
On thing I am sure of, the fish don't have speed guns.
Without a GPS, I would do what JAVeil suggested. Put the lure in the water where you can see it. Get it working right and let the line out. Of course, when you change directions to wind and current, that lure action may change. So also look at the tip of your rod to get that rod tip action working right. Even, with a GPS, that is speed over bottom, trolling speed may vary. Current will possibly make the lure work differently. There tends to be a range that the lure will work within. In any event, during a day of trolling, you should change speeds occasionally, to dial in the right speed.
On thing I am sure of, the fish don't have speed guns.
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