Bruce in alaska wrote in news:fast-CAEC19.11221012062008
@netnews.worldnet.att.net:

Not really relevant in Depth Sounder Transducer design. Most Sounders
at using LOWER Frequencies than 500 Khz, and the difference in cable
length would only be a very small fraction of a Wavelength, at that
frequency.
T

I think the manufacturers are not recommending it because of the molded
plugs and tech support headaches created by some non-technical boaters
cutting the wires then screwing up putting the shortened wires back
together without shorting the cable and blowing the transmitters.

I can see their point.....(c;

It's more a human problem than anything technical....