Boat size on lowrance charts

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Wheni use my charts on 3d mode I am able to change my boat icon. I don't use 3d much tho. Is there a way to set up boat details so that they reflect my actual boat size on the chart? My boat is 21 feet when range rings set to 50 feet it looks like in in a 4 foot boat. I feel like there should be a icon reflecting the boat size and the ability to set where the GPS for the ghost puck and the point 1 antenna. This will make the system more accurate possibly for those small off shore sweet spots