Got a question about a couple of depth finders for you gurus who know the difference. I once had a Eagle Seafinder 480 depth finder and liked it alot. the specs: Depth capability to 1500 ft* (457 m) with 4000 watts of peak-to-peak power (500W RMS).
I'm comparing the Eagle Fishmark 480. The specs: Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power.

All other features are the same. Maybe the SF comes with speed and the other doesnt but that's not important to me. Even though the Seafinder has a much deeper depth I'm really only interested in depths of 100' or less.

My question is: Do you guys think the wattage (peak-to-peak poower) on the SF is because of the extra depth only and would the detail of shallower structure/fish (100' and less) on the Fishmark be as vivid? Another wy to put it...using the single depth frequency do both units use the same power? This has always been confusing to me and wondered if you guys could straighten me out.