So i just installed a798SI to my Trolling motor now i have one in the dash and on the bow of the boat!! i am amazed at how much better the picture is on the trolling motor SI unit as long as you keep the motor straight you get a very high quality drawing. anyway my question is when i mark a spot and i want to cast to it whats the best way because i loose myself on the map where the boat is in correlation to the spot. when i mark spots using the outboard i just drive over it and drop a marker, but now with the trolling motor i just want to cast to it without droping a marker whats the best way to do that??