[world-cruising] range to detect surface targets with fwd scan

• Previous message: Ken James: "[world-cruising] seeing containers with fwd scan sonar"
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Interphase says they use a 10-12 deg downward angled beam depending on the
model.

So to see a shipping container at 12 ft depth you need to be no more than
about 100-90 ft from it. Much too close to be of much use for dodgeing
shipping containers.

The min depth I was refering to is the depth of your boat minus this beam
angle factor.-Ken

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• Previous message: Ken James: "[world-cruising] seeing containers with fwd scan sonar"
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