Dude,A fishfinder won't shoot through the hull of any decent-sized sailboat. Tried that. Didn't work. You have to mount it on the transom. Also, the Humminbird I briefly owned a couple of years ago didn't list depth in fractions of a foot. For a sailboat, it's very important to know whether you're at 4 feet or 4.9 feet.
I speak from experience on do it right or do it twice. I brought back the Humminbird.
I also did the blob of silicone to mount the original transducer on the Raymarine. Yeah, it worked to 200 feet, but not to 400 feet, and it sometimes couldn't read grassy bottoms in shallow water, when I really needed it. It also worked loose eventually at an inconvenient moment.
The P79 gives great readings in all conditions. It's mounted permanently and won't work loose in bad conditions.
The problem with taking shortcuts is that they add up and eventually you have a shoddy/dangerous boat. If you need it, you need to do it right.
I spent several years undoing shortcuts and quick fixes on my boat after buying it. With most of them, a couple of extra dollars was all it would have required to do the job properly.
Sounds like a plan. I hope you didn't think my "do it right" question was for you though. You asked a good question and I wanted to hear clarification on one of the answers you got. Sounds like this will work great for an inland lake.My sailboat is a 1981 Catalina 27. I sail on an inland resevoir with a maximum depth of 50ft. By "do it right", I meant that I will spend the extra dollars for a fish finder. Thanks all for the input.
I agree. That is why one chooses horses for courses and context is important when making gear suggestions. A recreational sit on top kayak isn't appropriate for ocean passages but I wouldn't tell anyone they are dangerous or second rate if they asked online for an opinion on one. They are just built for the intended use. My 21 foot expedition kayak could be represented as the "only safe and appropriate" solution if I wanted to play that way....
As far as shoddy/dangerous, one thing I've learned sailing on the ocean is that stuff breaks, especially when you take shortcuts and buy cheap gear.
A second-rate installation that does just fine on an inland lake is sure as hell going to fail when you're getting bounced around in 8-foot seas in the Gulfstream or slamming through a 5-foot chop in an East Coast inlet.