As far as accessability and accuracy of the reading, where is the best position for the through hull?
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Instead of locating a place for a through Hull, use a Hand held GPS unit. Through hulls may leak and also foul. I use my Hand held GPS for speed, works fine. I have a 1970 Catalina 22 and the less holes I put in the hull the better I like it. I have seen friends with through hulls and they seem to always have problems with seaweed and other growths on the under water units. I use the Garmin Etrex Mariner with great success. I even took it on a Cruise through the Panama Canal, I checked the speed on the GPS with the ships speed, The GPS correlated with the ships speed. Fair winds AL
Sometimes it's VERY helpful
to know BOTH your SOG and your speed thru the water. Your boat, your choice. Check the C22 Assoc. website for more details and answers to your questions.
to know BOTH your SOG and your speed thru the water. Your boat, your choice. Check the C22 Assoc. website for more details and answers to your questions.
GPS is way more useful at equal cost.
I agree with Al. I have a Standard brand of knot meter with the required hole in the bottom of the boat. It was mounted on the starboard side of the hull, forward of the mast. In this location it is very hard to hit from inside the boat. That is a +. It works 75% of the time. This is a -. My handheld gps tells me the speed of the boat, distance covered, elasped time, time to target, makes a map of where I've been and on and on. This is a multiple of +++++. I also can take the gps in the car, take it hunting and "geo catch" with the kids. Speed over ground and distance/time made good is also easy to determine with a gps. All for very close to the same cost. Ray
I agree with Al. I have a Standard brand of knot meter with the required hole in the bottom of the boat. It was mounted on the starboard side of the hull, forward of the mast. In this location it is very hard to hit from inside the boat. That is a +. It works 75% of the time. This is a -. My handheld gps tells me the speed of the boat, distance covered, elasped time, time to target, makes a map of where I've been and on and on. This is a multiple of +++++. I also can take the gps in the car, take it hunting and "geo catch" with the kids. Speed over ground and distance/time made good is also easy to determine with a gps. All for very close to the same cost. Ray
Raymarine
I installed a Raymarine, ST-40 bi-data unit on my C-22. I mounted the display in the center of the cabin just inside the pop-top opening. I love this unit; yes, sometimes debris will foul the paddle wheel, but it is great having both speed and depth clearly visible on both tacks. Because of my trailer configuration, I mounted the transducers on the port side of the keel...where the keel bolt is located. The knotmeter reads a little different on each tack. The best place to mount transducers in in the center forward of the keel. I love my toys, including my GPS, but I wouldn't trade for the ease of reading my speed/depth meter. David
I installed a Raymarine, ST-40 bi-data unit on my C-22. I mounted the display in the center of the cabin just inside the pop-top opening. I love this unit; yes, sometimes debris will foul the paddle wheel, but it is great having both speed and depth clearly visible on both tacks. Because of my trailer configuration, I mounted the transducers on the port side of the keel...where the keel bolt is located. The knotmeter reads a little different on each tack. The best place to mount transducers in in the center forward of the keel. I love my toys, including my GPS, but I wouldn't trade for the ease of reading my speed/depth meter. David
Yeah But........
I'm interested in boat speed thru the water. My GPS won't give me that unless there is no current or leeway involved. I admit I'm just now learning all this stuff but it seems to me that a speed log is the only instrument that will indicate boat speed thru the water, and I'm guessing the best place for the thru hull is somewhere ahead of the keel but not necessarly directly on the hull centerline.
I'm interested in boat speed thru the water. My GPS won't give me that unless there is no current or leeway involved. I admit I'm just now learning all this stuff but it seems to me that a speed log is the only instrument that will indicate boat speed thru the water, and I'm guessing the best place for the thru hull is somewhere ahead of the keel but not necessarly directly on the hull centerline.
Just be sure nothing will hit the transducer.
If mounted on the centerline forward of the keel then you would be in the aft storage area in the V-berth and that could get whacked. If you move outboard in that area or build a protective cover then OK. Also make sure the unit can be removed and the plug swapped in without a major hassle.
If mounted on the centerline forward of the keel then you would be in the aft storage area in the V-berth and that could get whacked. If you move outboard in that area or build a protective cover then OK. Also make sure the unit can be removed and the plug swapped in without a major hassle.
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