I have my transducer mounted to my trolling motor.  My trolling motor is a Power Drive with I Pilot which uses the remote .  I have the unit mounted in the front of the boat.  When I am largemouth bass fishing I have the chart speed set to 1 which is about the same speed that I am moving.  The problem is when ever I move the trolling motor the graph has to redraw and I get the line.  I tried changing the chart speed to 10 so it would redraw much quicker.  It seems like this was working fine, maybe even better because I could turn the trolling motor different directions to look at other structure.  What are the drawbacks from having the scan speed set so high?  Thanks for any suggestions.