SHALLOW WATER & CHANNELS

STARFISH SHALLOW WATER & CHANNELS

When operating in shallow water and channels, you may experience a 'ghosting' effect caused by acoustic returns from previous sonar 'pings' still bouncing between targets and the sonar receivers.

To reduce these effects, use a larger 'range' on the sonar display, which should have the effect of slowing the 'ping rate' and allowing time for these echoes to dissipate.

In shallow water, you may also see distortion on long range targets, caused by 'multi-path' phenomenon (see figure opposite) where sound is reflected between the seabed and surface before hitting the target.

Due to surface waves and chop, the effect can manifest its self as ripples on distant targets.