I really think that most folks troll too slowly. Part of the problem is that marine speedometers are not very precise or standardized.
Think about it for a minute: You may have a built in speedometer, a "paddle wheel" on the back of your transducer and a GPS/chartplotter all displaying different readings!
Getting the right trolling speed on your individual boat boils down to one thing and it's none of the above...
The only thing that takes all the forces acting on the boat into account is... Drumroll please... Downrigger wire angle!!!
With your cannonball in the water and your boat stopped, the wire angle is zero. As your boat begins to move, the wire experiences water friction and begins to "blow back".
I like an angle of 45 degrees for coho and blackmouth, less for pinks and mature chinook. Once you get the wire angle that looks right, note the GPS speed over ground. If you have a tail current (which you should if you're "going with the flow") you might be surprised at how fast you're actually going!
