True. Example: rods tilted up versus down on the back or sides of the boat will change how deep your jigs run by possibly a foot or two. Much less if you have like a striper or catfish bar across the back of your boat with rod holders on it. Like Ronnie said....cut a few barbs off a few jigs, start trolling towards shallow water, and see where the rods bounce and take notes. Wont take you long and when you see fish on the sonar you'll know ALMOST EXACTLY how to attack. ('Course that depends on your extent of going thru the learning curb on the shallow flats with different jigs and speeds.) I hear ALOT of folks saying how deep a certain jig will run, but remember that all boats aren't designed the same so everybody wont experience the same results.