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Discussion Starter · #1 ·
I have a Catalina 22 on which I am interested in installing a chartplotter/sonar system. I have been idly looking here and there but am now getting serious and would like to make a purchase in the next several months.

I will admit that this is rather new territory for me, so forgive my ignorance. There appear to be an overwhelming number of options and potential setups.

I am looking hard at the Garmin echoMAP 50dv. The stock unit comes with a transom/trolling motor mount, but I am likely going to switch this out for an in-hull. I am looking at the Airmar B117. There are at least two local boat shops with whom I've done business who can do the in-hull install. Assuming that this is a decent setup, I had a few questions regarding chartplotters, tranducers, etc.

1) With a chartplotter system like this, is your speed calculated via GPS? I would like to have real-time speed information, but I didn't know if I needed a transducer with speed functionality, such as this. I'm guessing this one can be used on non-GPS systems to calculate speed by measuring how fast water is moving under the hull?

2) Would a tilted element transducer be better? The whole concept of a tilted element transducer is a little confusing to me. Is the transducer angled to offset the slant of the hull? That is, if the transducer is flush with the hull, instead of pointing at an angle in front of your boat, the beam is angled downwards to keep it perpendicular?

Thanks in advance.
 

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Discussion Starter · #3 ·
Haha, yeah, I will admit the thought of drilling a hole in the bottom of my boat does make me a little weak in the knees.

This may be a dumb question, but the shoot-through-the-hull transducer will not be able to give you speed or temperature readings will it? Are these pretty much only used for depth? Honestly I don't really need speed or temperature readings, but part of me feels like if I'm going to go through all this trouble, then what the hell I might as well go all out.

If I did buy a transducer that could calculate speed, I guess it would depend on the particular display you're using whether or not it would show speed from the transducer in addition to the speed from the GPS. I guess I would have to ask Garmin what this echoMAP model would do.
 
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