Movement. Just like mild current under the ice pushes your jig far enough out of center cone to make it difficult to detect; your boat no matter how you anchor it, is almost never still. Increasing the angle decreases the power so while you will be able to see larger objects further away; like structural changes and large fish, you will have greater difficulty detecting smaller objects like your lure unless they are close to directly under the transducer. With the power needed to see your bait further away on the edge of the cone, you will pick up so many other things, like every minnow in the cone’s angle–so much that you won’t be able to detect which mark is your lure. Use the flasher to mark the fish and then use an action that will encourage the fish to bite. You may have more heads turned than when ice fishing, but in a boat you should be able to introduce your bait to many more potential takers, evening out the odds some.