Originally Posted by Massjester
I'm sorry if this is an inane question, but why wouldn't sonar be useful for detecting sub surface objects at sea that might present a navigation hazard.
CHIRP is amazing for fishing
and finding diving
sites. What it is is essentially a broadband
Sonar that is capable of using a wide frequency range instead of a fixed frequency to discern great detail. I had a Dragonfly on my last fishing / diving
boat and it was good for that, but don't see the need for a sailboat, as far as navigational hazards, youv'e hit it by the time you would see it.
At least on the dragonfly the xducer was a pretty good sized teardrop shape that looked low drag, pretty sure if it wasn't the 40 mph speeds of my old boat would have torn it off as it used the same plastic transom mount others use. But transom mounted on a sailboat it would be out of the water flow mostly so drag should be almost non existant.
On the Garmin
, you may be able to use a shoot through the hull
xducer, that is how I did the one for my 740s, that way no external xducer and no additional hole in the boat, but my 740 was not CHIRP, so I don't know.
If I had a 741, I'm afraid I'd want the CHIRP xducer just to see a detailed picture of the bottom just because I could, maybe not real useful, but it's cool seeing the bottom in detail