What Furuno model? Do you run your unit's in manual mode or Auto?
Auto uses filters and stuff can be missed. I ALWAYs use Manual mode. Hence the need for knobs to make quick adjustments and no Stupid menus to jump thru.
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I was thinking of mounting the in hull somewhere behind the seacock,]/quote]
Not a good idea. The scoop on the seacock will create bubbles. the bubble will screw up the pix. I bet you would only get a decent pix with the boat dead still.