Is there a NON THRU HULL Knotmeter?!?! - Page 3 - SailNet Community
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post #21 of 25 Old 05-08-2019
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Re: Is there a NON THRU HULL Knotmeter?!?!

I realize this is a very old thread that got resurrected, but it's interesting.

Has anyone used one of the ultrasonic speed sensors? Paddlewheels seem like such a pain in the pita.

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post #22 of 25 Old 05-08-2019
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Re: Is there a NON THRU HULL Knotmeter?!?!

I use the Airmar CS4500 speed and temp. it is about 4 years and works very well. dead on calibration never varies. we use a thru hull depth sensor but almost never look at it. no thin water here.
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post #23 of 25 Old 05-08-2019
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Re: Is there a NON THRU HULL Knotmeter?!?!

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Originally Posted by capta View Post
The point is, the ultrasonic speed sensors and GPS are exactly the same. They tell you speed over the ground. A paddle wheel gives you speed in relation to the water you are in, two completely different things.
If you have a good GPS plotter, it's pretty easy to see set or drift on the screen, otherwise, it is nice to have both speed sensors to help determine current.
Really? I thought they were using some ultrasonic magic to measure water turbulence or something to give you speed through water.

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post #24 of 25 Old 05-08-2019
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Re: Is there a NON THRU HULL Knotmeter?!?!

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Originally Posted by capta View Post
The point is, the ultrasonic speed sensors and GPS are exactly the same. They tell you speed over the ground. A paddle wheel gives you speed in relation to the water you are in, two completely different things.
If you have a good GPS plotter, it's pretty easy to see set or drift on the screen, otherwise, it is nice to have both speed sensors to help determine current.
not the same. the ultrasonic reads the particles in the water with two sensors a set distance apart to determine the speed thru the water, GPS works off a satellite and is slow to react.

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post #25 of 25 Old 05-08-2019
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Re: Is there a NON THRU HULL Knotmeter?!?!

Yeah. I guess there are newer ones.
Sorry, wrong again. My bad.

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