I would go for the biggest screen you can afford. I don't know if I would want side imaging on the bow on anything less than a 9 inch screen. Your standing farther away from it and details will be tuff to pick out on side imaging. I think I would look more into the biggest screen/chirp/di unit I could get. Di will show you good details on about any size screen, but still.... bigger is always better. Chirp is not a have to have feature... but it's nice. It provides real nice target separation on the screen. A gen2n unit would be a have to for me so that i could share waypoints between units.