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Old 02-13-2019, 03:09 PM   #1
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Transducer Depth

My Mainship 400 was recently on the hard and I decided to take an accurate measurement of the depth of the transducer from the bottom of the rudder, which is the lowest point on my boat.

The previous owner told me that the transducer was 18" from the bottom of the rudder. The transducer is mounted on the port side bottom just under the Racor in the single engine version of the Mainship 400.

I had set the depth finder gauge at 18" relying upon the former owners information. So after measuring the transducer, it's not 18" from the bottom on the rudder. It's 29" from the rudder bottom. I've had the boat for one year and had an actual depth of the boat that was 11" deeper than the depth gauge was set for. Never went aground but I guess I was lucky.

If your boat is out of the water, good time to check the measurements to be sure your depth gauge is set properly.
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Old 02-13-2019, 04:45 PM   #2
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Good point. Im planning on checking and adjusting mine. I've always assumed 2' but as you found, might not be correct. best to actually know.

Up here in the NE where the bottom is so variable, I always want several feet or more, but in some places, one can be within a few feet of the bottom for miles and that's normal.

Ken
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Old 02-13-2019, 06:28 PM   #3
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Measure twice / Len


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:) My personal experience &/or my personal opinion-feel free to ignore.
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Old 02-13-2019, 07:09 PM   #4
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...and make sure you get the +/- sign right.
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Old Yesterday, 04:12 PM   #5
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If an 11" variance is the difference between floating and grounding, the water is too skinny for me to traverse.
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Old Yesterday, 04:46 PM   #6
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During refit last year, to align both depth instru, recorded measure from xdcr faces to deepest keel depth (running gear in pocket between keel & hull-protected). After launch adjusted instru so displays show water depth under keel,alarms set at 2ft. Installed forward sonar (2 dimensional picture) that sees 6 X current depth ahead; we only use when in skinny water.
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