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Old 14-03-2018, 03:33   #1
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Join Date: Jan 2009
Location: St. Louis, MO
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Airmar DX900+

I would be interested in comments from owners of the Airmar DX900+ (an ultrasonic speed, depth and water temperature sensor).

I'm considering buying one, and while they are pricey, it's an all-in-one solution. The one thing that gives me pause is they don't want you to put anti-foul on the transducer face. It seems to me it will be a bear to keep clean enough to work.

It also appears that the electrodes protrude from the transducer face making it a problem for cleaning the bottom of the boat while in the water.


Currently traveling the east coast.
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Old 18-03-2018, 04:33   #2
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Re: Airmar DX900+

I would be interested as well ...

Is there another brand (cost ?) providing the same system ?

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Old 18-03-2018, 04:55   #3
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Re: Airmar DX900+

You might want to check Panbo before purchasing...
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Old 18-03-2018, 04:56   #4
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Re: Airmar DX900+

I think the newest version is UDST 800? Here is a Panbo article, with mention of it and the DX900.

I am interested as well. Wondering just how clean they have to be kept to work correctly. For instance, do they work when the hull has a layer of scum?
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Old 19-10-2018, 17:47   #5
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Re: Airmar DX900+

Interesting … 'do not anti-foul the transponder face'.

However … this product seems pretty clearly targeted at (and priced accordingly) the 'serious' racers. Serious racers lift their boats and clean, even sand, their hulls before every race … so in the racing season … there wouldn't be much opportunity for the transponder to foul up.

Anyway … it comes with a nice flappy-valve gizmo to make withdrawing the transponder at sea easy. So just pull it out … replace with the blanking plug … then clean it … after every time you use the boat. There replace it next time you want to use it.

If you are using the boat continuously, e.g. cruising, just make it a daily ritual to pull, clean, replace.

So I don't see the 'do not anti-foul the transponder face' edict as much of an issue, really.

The reports of widely variable readings is more of a concern. Those same 'serious' racers would not take kindly to paying that much for something that is unreliable. The sooner Airmar sort out this issue … the better.
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Old 19-10-2018, 17:59   #6
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Re: Airmar DX900+

I have had a CS4500 installed in my cruising boat for several years. This is the same technology as the DX900, but without the leeway measurement.

I would never, ever go back to a paddlewheel. The readings are stable and consistent. For the first 18 months we ran it side-by-side with our former system, and they both agreed as close as reasonably could be expected.

I can not answer if it is suited for a high end racing boat. That is not my game. But for a high milage cruiser, it is SOOO nice not having to worry about a fouled paddlewheel every day, and having data I can trust. Nice also having good data at lower speeds.

We use a standard water based, transducer antifouing paint on it, reapplied about every 6 to 8 months. Works a treat.

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