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post #1 of 4 Old 09-04-2007 Thread Starter
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Calibrating depth sounder

I have a 1976 Cal 27 sailboat. The depth sounder is off by a foot and half. I want to recalibrate the sounder so that it reads true. Does anyone have any suggestions as to how to go about this??

The depth sounder is a "Standard Communications Corp., New Zealand," "Horizon Depth," model "DS45."

Look forward to your suggestions.

Thanks very much,

Jack Chute
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post #2 of 4 Old 09-04-2007
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If you're talking about this:

Then you might want to try this website: LINK

Although they don't have the manual for the one you have, I would guess that the two that are listed probably use similar software and are probably calibrated in a manner very similar to that of the unit you have. Might be worth downloading one of the other manuals and trying the procedure listed there.

BTW, they are pretty good at responding to e-mail requests from what I've it might be worth inquiring via the website.


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post #3 of 4 Old 09-04-2007
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Sounds like a standard horizon model. Their website is

I also have a DS45 - I e-mailed their support folks listed on the website, and recieved a mailed copy of the instruction manual within 2 weeks.

If this isn't going to work for you I might be able to look out my copy next time I'm at the boat and pm you with the relevant details.
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post #4 of 4 Old 05-15-2009
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Not sure if you are fixed but I have a manual for the DS45 and have just been looking up how to calibrate the thing. Seems you can't ! My issue is that I have replaced the coax cable (longer - changed position) and mine is now reading a factor of 10 out. I understand these units are sensitive to coax selection and power input (operating voltage specified as 13.8VDC + or - 20%). You may want to check your connections. Alt - can you simply set the keel offset to overcome your issue ? Press depth and on at the same time and hold for 3 seconds. Press depth and on again to go to the keel offset screen and yo will see +0.0 (if no offset set). You can then + or - the depth to suit depth at waterline or under the keel or below the tansducer or.... NB: the first screen (Lo) is lamp intensity and you can scroll this up or down also. Cheers.
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