Harry how have you been? Yep, before you know it we'll be walking on it!!
I troll pretty slow about 1.2mph on the gps, so if it's 100' deep I can usually get a good "snap" on the lure with 11 colors out. If the wind is pushing a little faster I have to let out more lead and if it's slowing me down I let out less lead. It's kind of trial and error, but usually I'm on the bottom within a half a color of the actual depth.
Robb