"Dennis Pogson" wrote

You are never going to believe this, but when searching for the most
suitable place to locate an in-hull transducer, a British company found
that
of the 15 or more different materials they tried for maximum sensitivity
on
the transducer head, MARMALADE was far and away the best!

Most boats have at least a jar of marmalade in their food lockers. Save
you
paying for exotic materials to do the same job!

Spread it thickly!

Dennis.

Reminds me of a chorus the rugby teams used to sing:

"Rule Britannia, Marmalade and Jam
5 Chinese crackers up your a??-hole
Bang, bang, bang, bang BANG."