The big Speedometer

[mrbillfll]

I've always used the paddle wheel to detect changes in speed. sog or vmg help with tactics. but when trimming I look at the speed from the paddlewheel.

I'm surprised I haven't heard of depthfinder speed being more accurate... since it would be more bullet proof. those little wheels are always getting stuck or breaking...

any models to recommend?

[Crikey]

This manufacturer's link looks promising:
http://www.airmartechnology.com/

There are many other competitors and I've much more research to do before I can decide what has the best price profile. Others views would be appreciated...