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5 other echoes, Fish school density, Plankton – Furuno FCV-1200LM User Manual

Page 70: Current rip

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Fish school density

If two fish scools appear with the same color at different depths, the one in deeper water is
denser because the ultrasonic wave attenuates as it propagates and the fish school in deep
water tends to be displayed in a weaker color.

Fish Echo

Less Reddish
(Sparse echo)

Reddish
(Dense echo)

Difference in
signal strength

Weak Echo

Strong
Echo

Fish school density

4.5

Other Echoes

Plankton

A plamkton layer, a likely place to find fish, is displayed in green or blue dots. It usually descends
in the day and rises at night.

Fish School

Plankton

Plankton

Current rip

When two ocean currents meet with different speeds, directions and water temperatures, a
current rip develops. A current rip’s on-screen appearance is as shown below.

Current Rip

Current rip

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