? Worth looking at - www.birdcontrolaustralia.com.au - as have solar ultrasonic,which could be worth a try ?
Have their rotating spiders on deck,that deter nesting seagulls enough,to try elsewhere !
Pelicans are a challenge !!
Wonder how they keep them off Streetlights ?

Lazzz,
Interesting, I was talking to Garmin Australia tech line today and they said the solar wireless get the most complaints due to bird poo on the solar panels. They suggested stick with a wired system or else you have to climb the mast regularly for cleaning.

Are the cables generally run down a conduit inside the mast? If so if I mouse the new cable to the old then I would be able to pull through the new one?

EastCoastSail said..
Seeking a Shag and occasionally Pelican resistant transducer.

Tinder? Post some pics of your boat, should do the trick.

Can't help with the pelicans.