Question about Navman Fish 4150sx GPS Receiver

1 Answer

Navman 4150 fishfinder

This finder loses its track of depth and speed from time to time. do you know why this might be????? cheers

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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.

Posted on Feb 24, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

When we are deep water (500 ft or deeper) the fish finder will display 3.5-10 ft. and won't show the fish or shows tons of fish. Are we able to set the depth that we would like to see eg: if we are...

Im not familiar with your particular unit but you should be using a low frequency transducer for water over 500'; something like a 50 kHz transducer or a dual frequency transducer like a 50/200kHz for detail with the high freq. but increased depth range on the lower frequency. As far as setting it to 250 ft, you should be able to use the range feature and adjust the maximum to 250'. typically the factory default is automatic so it will caonstantly adjust the range based on the maximum current depth.

May 22, 2011 | Standard Horizon Standard Ff520 Fish...

3 Answers

My depth finder loses its depth reading at about

You need to set the transducer lower. When at speed, the hull of the ship raises up out of the water and hence your transducer is probably not deep enough at these times to give a proper reading.

Jan 21, 2010 | Humminbird Boating

1 Answer

Problem with navman 4150 fish finder

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.........

Jan 07, 2009 | Navman Fish 4150sx GPS Receiver

1 Answer

4150sx finder erratic depth

I had the same problem last time I was out in shallow water (in less than 2 metres of water) and I suspect that the problem was weed wrapped around the transducer but won't know for sure until I take it out on the water again. I had another problem re water temp which I'll enter separately.

Nov 05, 2008 | Navman Fish 4150sx GPS Receiver

1 Answer

Navman 4500 fish finder w/transom mount transducer

I finally got an email reply from Navman. If the unit is less than two years old (mine is not) they will repair it. If it is over two years old, or if you can't prove that it is less than two years old, you can ship it to them and they will repair it for the low, low price of 355 US dollars.

Pretty nice of them since it appears these units are highly problematic isn't it? I am wondering if they guarantee their fix, or just have you on the hook for another 355 dollars later.

Good Luck Everyone,


Sep 20, 2008 | Navman F4100SX Fishfinder - W/ Transom...

1 Answer

Navman 4150 sx

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


Albie Rossouw

Jul 20, 2008 | Navman Fish 4150sx GPS Receiver

Not finding what you are looking for?
Navman Fish 4150sx GPS Receiver Logo

Related Topics:

973 people viewed this question

Ask a Question

Usually answered in minutes!

Top Navman GPS Experts


Level 3 Expert

77939 Answers

The Knight
The Knight

Level 3 Expert

75017 Answers

Martin Murray

Level 3 Expert

1623 Answers

Are you a Navman GPS Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides