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Author Topic:   SONAR Transducer Placement
carlo2533 posted 06-08-2011 06:27 AM ET (US)   Profile for carlo2533   Send Email to carlo2533  
I have a 2010 [Boston Whaler 190 MONTAUK with a] Raymaine A57d with [transom-mount] tranducer. When [the boat speed exceed] 20-MPH [the SONAR shows] two blinking white lines instead of depth. [Where is the] best place to mount the SONAR tranducer so it can work better? carlo2533
jimh posted 06-09-2011 08:58 AM ET (US)     Profile for jimh  Send Email to jimh     
Follow the manufacturer's recommendations for SONAR transducer placement. Some SONAR transducers will not work well at planing speeds, no matter where they are located, due to their design. The depth of immersion of the transducer is often very critical. Movement up or down in increments of 0.25-inch can produce significant change in operation at high speeds. Since you have provided no details of where the transducer is currently mounted, it is impossible to suggest changes. Perhaps you can describe in detail or illustrate with a digital image where you have installed the SONAR transducer.

You can also contact Boston Whaler customer service to inquire about the precise location that is used at the factory when the Raymarine echosounder is installed. I think they use Raymarine as their OEM accessory for echosounder.

jimh posted 06-09-2011 09:00 AM ET (US)     Profile for jimh  Send Email to jimh     
For advice on mounting location for a SONAR transducer on a boat transom, see

jimh posted 06-09-2011 10:51 AM ET (US)     Profile for jimh  Send Email to jimh     
Also, check the setting of the SONAR gain. Often, when operating the boat at speed, additional gain will be needed to maintain good echo sounding of the bottom. Many SONAR devices have automatic gain control, but offer the option of increasing or decreasing gain as needed.

Finally, perhaps you can show us a screen capture of what you are seeing on your raster display. This will help others interpret the current installation and what sort of performance you are getting.

wezie posted 06-16-2011 07:25 PM ET (US)     Profile for wezie  Send Email to wezie     
Is there any obstruction, like a through-hull, in front of the mounted transducer? The 170 MONTAUK has [an obstruction or a through-hull] on the [Starboard] side, so the transducer is on the [unclear, perhaps meant Port] side, to avoid the turbulence. Transducers are to be mounted deeper in the water than I thought. Good Luck!

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