[DG] [DG] Transducer for CP 470

[Derek - Raymarine - Moderator]

HI striperstan,
Thank you for your enquiry.

The in-hull transducer installation is the better option if you can overcome the tank leaking issue, it would we worth calling Gemeco or Airmar direct for some tips on degreasing the hull before mounting the tank, to ensure a long term and reliable bond. Perhaps the hull is flexing a bit which is triggering failure of the bond between the tank and the hull?

Gemeco can be contacted at this link here for advice.

The alternative as you mentioned is the pocket mounted transducer version found here , we have virtually no installations of this type of transducer here in the UK, due to the hull types and market that prevail. The main issue with the pocket mount is the work required to modify the hull to create a recess into which the transducer will fit from the outside of the hull. This will need to be accurately formed and well glassed into the hull to avoid loss of hull integrity.

If mounted in the Keel, this will give the best performance from a beam point of view, whereas mounting off-centre, you will need to be certain the transducer beam does not impinge on the keel or hull fittings. If mounting in the keel, be aware of the fact that if the boat grounds this can damage the transducer face.

The actual performance from a sonar perspective is likely to be the same as for a conventional through hull transducer or an in-hull unit.

Regards
Derek