Originally Posted by
wicklundrh
It is created from where the line actually enters the water!
Many of the dive charts are actually created using planer boards. You let out your desired amount of line, and clip on the board, from there you let it out away from the boat.
How do I know it is from where the line hits the water? Well, I happen to know the guys that own precision trolling. I know where they test it, how it is tested, and who is testing it!
The testing is actually done with divers in the water and very specific measured depths. Each bait is tested based on speed, type of line, size of line, and now with clip on weights. It is monitored from several angles as the bait passes over the measured depth field. Mark Romanak and his son Jake own and operate precision trolling. Mark is also the head pro staff member for Off Shore tackle and the editor of Off Shore's "Release" magazine.