The nice thing about the probe is that the beam can be changed in direction and size from directly down to front and adjustable in speed of scan..
Ours still works but after its been on for awhile, it keeps shutting down every couple of minutes..
Its a really valuable package on the boat once you have one and know how to read it..
A couple years back we were entering "MOSS LANDING" between Montery and Santa Cruz
on the west coast
of the US. entering the harbor, I figured I was ok due to the fact we were within the marked channel.. the wife setting beside me stated we were comming in over the rocks.. in looking over at the probe, she was right, and a quick left turn avoided the problem..
After talking to the locals, we found that at low tide, when the wind
is from the north, the channel marks drift to the south side of the channel, AND OVER THE ROCKS...
many other times the probe has saved us, on a couple different boats.........