Navman 4500 fish finder w/transom mount transducer
My almost new fish finder cannot find the transducer and goes in to simulate mode. I purchased a new transducer only to find out that the transducer was apparently not the problem. Does anyone have a similar problem with the navman and, if so, is there a fix or solution? LB
Re: 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.
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It is my understanding that Hummingbird MHX HS is a transom mount kit. So it will depend on what you are mounting. It is likely the mount instructions are available with the transom transducer you are going to mount. Please drop a comment to clarify.
For details of all Hummingbird manuals refer to
First do a factory reset and determine that all the setting are correct. You can get this info from the manual. Remember you will loose any saved way points when you do the reset. If that does not sort you out;Remove transducer from transom mount and duck tape it to a broom stick so that the transducer face is facing down. With the boat standing still in calm water and the ducer hooked to the DSM25 push it below the water and see if it see bottom on 50khz.The idea here is to get the ducer in another location to see that it is not getting reflections of the boat. 50Khz is very prone to reflecting of stuff around it. If you still have a problem I would send the ducer and DSM25 unit back under warrant .No need to send A65 back it should not have a problem.
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.........
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.
I don't think your old fish finder is the LMS-332C GPS Receiver listed above in the description. You don't need the speed wheel for the fish finder to function just the transducer and transducer mount. You should mount that on the back of the boat towards the center but not too close to the motor and not too close to the side of the board. Don't let it hand below the level of the boat. That should keep it from getting hit by the trailer or dragging on the bottom. Try to make it as level as possible. The green and white wires may be for the speed wheel but i'd need a model number for clarification. Hope this helps.
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.