Question about Navman Fish 4150sx GPS Receiver

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Problem with navman 4150 fish finder

Could you please help. I have a Navman 4150 fishfinder that has been working great. The last time I used it the depth numbers were showing the wrong depth and were flashing between numbers and blank dashes. I have checked the transduser to see if it had been knocked up or if weed was caught around it but all looked okthe water I am using it in is salt water and very clear.The unit is about 3 years old now and has not had a great deal of use.Hope you are able to help. Cheers

Posted by northweatern on

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  • Michael Brophy Jan 09, 2009

    My Navman 4150 was working fine and then suddenly stopped showing the depth and anything in between, just -.- appears on the screen. It also appears as -.- on the data screen. However, you get the full works when you put it into simulation mode. This indicates to me that the transducer has a problem. Does anyone know for sure or does anyone know how to check the transducer?

  • Anonymous Mar 08, 2009

    I have the same problem. My 4150 worked great for two seasons and now will only function in simulation mode.

  • harry19612 Mar 19, 2009

    I have the same issue. 
    I have the 4150 with a through hull transducer. Recently I bought a transom mount transducer and the unit is working fine again.
    This means my T/H transducer is broken/malfunctioning, or ofcourse something with the wiring, however that seems highly unlikely to me.

  • Anonymous May 02, 2009

    I am having the same problems with a four year old Navman 4500. I have gotten no help from Navman "customer service". If anyone comes up with a solution, I would appreciate being in the loop. I will relay any info I find as well.





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I installed my Navman 4150 depth finder along with the Navman GPS unit when I purchased my Bayliner Trophy 20Ft. Offshore model. Everything was ok for one year and it has been downhill since then. Losing signal, unbelievable high depth ranges, blank periods, etc.. I now can't even get a reading tieded up at the dock. I am now giving up and shoping for a quality unit.. Cape Disappointment.........

Posted on Jul 21, 2009


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hello :

sir Any series used
You can choose manual from here.

dont forget rating this post if this is not helping u tell me so i can help u further .

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Go to the Website of and download the manual for the 4150 and 4150sx
Hope this will help


Albie Rossouw
[email protected]

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Depth: Could be for a number of reasons, too deep for the sounder - check the manual for it's max depth. Dirty water, sounder unable to penetrate through to the bottom. Weed or other debris covering the transducer. Transducer on a swing mount & being pushed out of alignment then dropping back in once stopped.

Speed: Is the speed readout controlled by a GPS or paddlewheel? If it's GPS, check the power connection of the sounder, may be loose which would also cause the depth to 'drop out'. If it's paddlewheel, you're down to bad connections or faulty unit.

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