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Boat speed not registering.

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Old Racer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Topic: Boat speed not registering.
    Posted: 01 September 2023 at 10:16
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   
Hanse 320 Olicana Inverkip Scotland
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2023 at 11:40
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.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2023 at 12:35
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.
Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2023 at 12:40
Many thanks
Hanse 320 Olicana Inverkip Scotland
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 02 September 2023 at 11:39
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.
H400 (2008) 'Wight Leopard', Gosport UK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2023 at 06:40
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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Old Racer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2023 at 23:50
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  
Hanse 320 Olicana Inverkip Scotland
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Post Options Post Options   Thanks (0) Thanks(0)   Quote redlion Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2023 at 08:33
I have found that reversing hard often frees the wheel.
It,s not over till the fat lady drowns
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2023 at 09:03
Unless you actually remove and clean the wheel, you canít be sure that itís not still fouled - and giving you an incorrect reading with all the subsequent errors this can cause.  Provided youíve got reasonable access to the transducer, swapping it out for a blank takes just moments with minimal water ingress.
H400 (2008) 'Wight Leopard', Gosport UK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2023 at 22:40
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
Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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