line counter reels

[m089221]

I was at the Niagara show a few weeks back and took a class on trolling dipsey divers for walleye.  One of the first things the instructor mentioned was calibrating your reel to read what the line counter was telling you.  I tried to write down the process to do it as I have several line counting reels that don't give you the actual line out reading but I wasn't fast enough to get it.  This process was supposed to do that for you.  I've measured off 100 ft in my back yard and some of my reels are within a foot of the actual 100 ft, no problem but others are off 10-25ft.  Would love to get these to read correctly or at least within a foot or 2 .  Does anyone know the process to get your line counting reel to actually read what the line out is.? 

[lost a lure]

 

[m089221]

THANK YOU!!!