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Thread: is there a non impeller speed-log? Reply to Thread
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  Topic Review (Newest First)
01-21-2007 09:52 AM
Originally Posted by f123olly
Speed=distance x time
A tennis ball on a measured string and a stopwatch will be about as good as anything you can buy...and its cheap!
Well, since our boat is faster, we found that shooting a Chihuahua dog over bord was more accurate...we tried several sizes. We found out that the ones whose eyes were sticking out more would be more accurate.

Good for foggy days, also, as we just shoot the Chuhuahua off the bow, and if he whines, then ther's something there!!!!

good thing is they swim back and are re-useable...

Just make sure not to throw your Chihuahua while in port, they don't have very good bounce back qualities!!
01-21-2007 01:28 AM
Here's one place with a price list for the NKE electronics.
01-20-2007 10:45 PM
Valiente I have a very old (late '80s) cathode ray tube depthfinder called a Marinetek Video Sounder.

I have NO CLUE how it works, but it involves a squared-off hull projection with a glass window (I dislike this on general principles...). However, it did work last season and did give a decent and fairly vivid idea of the bottom, but it sucked at depths over 40 feet, and eventually grew a coat of algae that meant it recorded all depths as 3.2 feet...I have to clean it this winter.

Did I mention that the Video Sounder (when scraped clean) gives a pretty accurate speed under way? Over about 1.5 knots, that is. I don't have an impeller thru-hull, just this old thing and a 1990s Raymarine chartplotter that tells me when I'm doing over 2 knots.
01-19-2007 01:29 AM
sailaway21 Other than dual transducer units for use in shallow water the only non-wheel log I know of is the pitot tube type. I know of none suitable for boat mounting, and they are all subject to damage due to their protuding beneath the hull.
01-18-2007 09:38 AM
Originally Posted by velero
of the Airmar Sensor that you got from Raymarine?
US$100 for the paddle wheel transducer. I think its too expensive. I already paid for a replacement Display unit earlier then found out that the transducer is also faulty. bummer.
01-18-2007 08:05 AM
What was the cost

of the Airmar Sensor that you got from Raymarine?
01-18-2007 07:28 AM
trantor12020 Check out Airmar at They have some speed sensors that uses ultrasonic (I think). Search for CS4500. It looks like Airmar made transducers (sensors) for use on many brands of instruments eg. Raymarine, Navman, Simrad etc....
Interestingly, just early this week, I ordered a replacement ST40 Speed transducer and found Airmar transducer in the Raymarine packaging. I called the dealer to verify and was told its indeed correct.
01-18-2007 01:08 AM
deckhanddave I wonder if this could be a function of a more advanced depth finder? I haven't done the research but I bet there is something like that out there in the fish finder/ depth finder market. Of course it would be limited by the depth of the water... once the bottom is past it's max range...
01-17-2007 07:22 PM
Ronbye Seafarer used to make one. It was originally installed on my boat before I bought it. I have just sent to one of our forum members both the Seafarer depth sounder and speedlog units.
01-17-2007 05:57 PM
f123olly OOPS! Speed = distance/time
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