There has been MUCH debate on this subject in RibNet, see previous postings (try a search on the subject).
It appears from the extensive research I have done (on the net etc.) that most fishfinders only work at slower speeds, due to the effect of planing and water disturbance. But, as I suppose they are FISH finders, they are actualy designed for fishermen milling about and looking for FISH, so we shouldn't be surprised!
I hope to get mine later in the year (remember to my BOSS
it's a SONAR), and I want (need
) it for the fun (necessity
) of just finding out what is under the boat.
I do remember though that there was a hand-held sonar (looked like a torch) that you could use in front of the boat.
Keith (still waiting for it) Hart