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Figure you have a beam angle most are around 21 degrees at mid sensativity. As the hole or structure enters your screen your just entering your beam area. In 30' of water with a 21 degree cone angle you see 23'of the bottom. Here is a link to a right triangle solver so you can play with cone angles and bottom coverage.

Here is also some great information from Lowrance on how fish finders work, cone angles, fish arches and so on. This page is about cone angles.

Lowrance info (good stuff)

Angle solver

[ 07-16-2003, 07:27 PM: Message edited by: fish_on ]
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