Ive been lookin for same info for awhile now!! Gradyfish is correct from what Ive been able to find. I got Android phone,go to play store,search Precision Trolling Data (free app). Purchase Google Play card to buy your info--1.99 each.Push Store ,then buy lures & packaged deals. Example: Rapala DHJ_12. you enter desired depth,and it will tell how many feet of line to let out at 1.5 and 2.5 mph. Dont know about the line you are using tho. Were going to try it out. Dont know how accurate it is ????????? Also has The Tadpoles on it. Good Fishin Shelly!!!