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Old 26 June 2016, 17:48   #1
Country: UK - Scotland
Town: Dunoon
Boat name: Ghillie Bhoy
Make: Humber
Length: 5m +
Engine: Yamaha 50hp
MMSI: 235117121
Join Date: Apr 2011
Posts: 29
Chart plotter depth adjustment

I have a standard horizon CP180i chart plotter. Is there any way of adjusting the depth reading on this. Mine tells me in 8ft of water when I'm in less than 1.
Many thanks in advance.

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Old 26 June 2016, 23:51   #2
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,621
You can usually set an offset (used to alter the reading to take the depth the transducer rises at into account - 1 or 2 feet normally), but that doesn't sound like your problem.

How does it read at more normal depths? anywhere near right?

The unit reads the delay between sending a pulse and hearing the echo and converts that to a depth. Shallow depths may get the return too quick to read. If that's the case, I don't think there's a lot you can do about it. Playing with the transducer angle might help, as might playing with sensitivity of the unit.

Mine (Lowrance HDS-7) basically just shows no lock when it gets really skinny.


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