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Boat speed not registering. |
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Old Racer 
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Joined: 09 March 2014 Location: Inverkip Status: Offline Points: 119 |
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 Topic: Boat speed not registering.Posted: 01 September 2023 at 10:16 |
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I have searched the forum to no avail.
I am not getting a reading for boat speed on my instruments. It reads 0.0. All other readings are present. It could be some weed stuck in the revolving wheel but I have never had that in the ten years of owning the boat. I am suspecting a fuse may have blown. My question is: Is there an in line fuse in the wiring between the transducer and the switch panel? Many thanks John
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Hanse 320 Olicana Inverkip Scotland
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Martin&Rene
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Joined: 06 December 2009 Location: United Kingdom Status: Online Points: 805 |
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Posted: 01 September 2023 at 11:40 |
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There is not normally a fuse in the data wiring, but there may be a junction box somewhere. You can check the continuity of the wiring with a multimeter. If you have had no weed on your impeller in 10 years, count yourself lucky. A consequence of situations like Storm Betty can (and I think did) lead to a lot more weed. When pulling the impeller make certain you know it's orientation and have Vaseline handy to put on the O rings.
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Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Black Diamond
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Joined: 24 October 2015 Location: Newport, RI, US Status: Offline Points: 874 |
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Posted: 01 September 2023 at 12:35 |
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I've never had one that didn't need to be cleaned every month. Consider yourself lucky. Not sure what you have for instruments, but if its a NMEA 2000 network (like B&G Zeus or other), you can display the network and make sure it sees the device first. THEN, go into the device on the network display and see the DATA coming from it. Usually you can see the boat speed there. If nothing is being reported there (for example, when you manually spin the paddle wheel) then you might have a bad unit. If you have data being reported correctly, then you might see what the "source" is for "Boat Speed". Sometimes there are multiple sources possible. The network computer, SOG from GPS, the triducer, etc... If its set to SOG for example, it doesn't matter what the paddle wheel says... :-) Good luck.
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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Old Racer
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Joined: 09 March 2014 Location: Inverkip Status: Offline Points: 119 |
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Posted: 01 September 2023 at 12:40 |
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Many thanks
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Hanse 320 Olicana Inverkip Scotland
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Ratbasher
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Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 472 |
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Posted: 02 September 2023 at 11:39 |
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I now routinely swap the sonar/speed transducer with the blank when moored for more than 3 or 4 days and I've often found tiny shrimps or other 'illegal migrants' in the the wheel housing. Before I started that practice I would regularly get the '0.0' reading which was invariably caused by a fouled wheel. If your speed and depth transducers are combined and the depth is still working OK then clearly you have power to the Unit, meaning that its either a blocked wheel or a faulty transducer. As Rick suggests, pull the Unit, spin it and see what happens.
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H400 (2008) 'Wight Leopard', Gosport UK
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415 Singapore
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Joined: 23 September 2013 Location: Singapore Status: Offline Points: 787 |
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Posted: 03 September 2023 at 06:40 |
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Hi, from my experience a 0.0 reading usually means the transducer/ speed wheel is ok, just jammed with marine crud. If it show -.- then there is a problem with the unit or the network.
All the best Paul
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Paul - Night Train - 415 #136
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Old Racer
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Joined: 09 March 2014 Location: Inverkip Status: Offline Points: 119 |
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Posted: 03 September 2023 at 23:50 |
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Thank you all for replying and the suggestions.
I went down to boat and with a friend dragged a rope gently from bow to to keel. This apparently freed the speed wheel and the reading was restored. Will check when she come out of the water. Many thanks for the wisdom John
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Hanse 320 Olicana Inverkip Scotland
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redlion
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Joined: 28 August 2013 Location: Creran Scotlan Status: Offline Points: 184 |
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Posted: 04 September 2023 at 08:33 |
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I have found that reversing hard often frees the wheel.
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It,s not over till the fat lady drowns
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Ratbasher
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Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 472 |
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Posted: 04 September 2023 at 09:03 |
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Unless you actually remove and clean the wheel, you can’t be sure that it’s not still fouled - and giving you an incorrect reading with all the subsequent errors this can cause. Provided you’ve got reasonable access to the transducer, swapping it out for a blank takes just moments with minimal water ingress.
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H400 (2008) 'Wight Leopard', Gosport UK
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Black Diamond
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Joined: 24 October 2015 Location: Newport, RI, US Status: Offline Points: 874 |
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Posted: 07 September 2023 at 22:40 |
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One more comment. If its an AIRMAR triducer (depth, speed, temp) the DST810 has a cell phone app that bypasses the NMEA network. In other words, you can see that: A. the unit is working and your cell phone has the right information. In this case, you have a NMEA/B&G setup/network issue. Or..... B. the unit is not working, so don't waste your time on the B&G / network side. FWIW
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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