"Doug" wrote in message
hlink.net...
I agree, the rubber sleeves on trackballs do rot, glaze over, disintegrate
with time. A little Rubber Rejuvenator available in years past from
typewriter or office supply stores is great to put on the rubber. It was
designed to soften typewriter pallets. I use it on pinch roller in tape
players, track ball and mouse rollers, etc.
Doug K7ABX

It amazes me to read that a chartplotter still works with rollers to pickup
the ball movement. A solution like Logitech has, with a ball with spots and
an optical sensor would be much better, especially in a marine environment.
The opening where tha ball is in, could be sealed watertight this way.

Meindert