Question about Furuno GP7000F/NT GPS Receiver

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Furuno sounder trandecer problems

I have a furuno 1650f sounder with a transom mount transducer. It works well at slow speeds but not at speed.It looses picture quility over 20km.It is mounted on a 6.8m alloy cat and the tranducer is within 100mm of the port side motor.I have played with the hieght but does not make much differance.I have been told to remove the tranducer to inside the hull onto a bed of marine silicon and use it as a floor mount, as it is mounted to close to the motor.Do you have any ideas as it is very frustating loosing the picture when i am on the plane.

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The leading edge of the ducer should be higher than the aft portion. The leading edge must not be below the bottom of the transom. To determine if it is turbulence or radiated interference, put the boat in neutral and run motor up in RPM, if it fails then, with boat stationary, then proximity to motor is a problem and you should buy and in-hull ducer. glueing the transom ducer may or may not work well.

Posted on Jan 16, 2010

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Posted on Jan 02, 2017

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In the unit is off when you remove the AUX power than when the AUX power is turned back on the unit will remain off.

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Good day, I just bought a transducer (R209) for my 1920 C furuno display but seem to have a probleem with the setup on the display. I have no radar connected to the system and to do the installation...


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I have a furuno fcv 585 echo sounder with a FURUNO CA50/200-12M -c13298 BRONZE THRU HULL HIGH PERFORMANCE TRANSDUCER. The transducer has 4 wires and it looks from the schematic that it attaches via a...


you need an MB1100 matching box has the 10 pin pigtail for your sounder and accepts bare wire input from your ducer
this will also ensure that all power from sonar get to ducer, but it from me if you like 847-746-0100

Jul 09, 2008 | Furuno FCV-582L GPS Receiver

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Depth sounder problem


If the transducer is mounted off of level, an error is introduced due to angle. It is a fixed percent offset, say 10%. so 10 feet reads 11 and 100 reads 110. There is an offset function to read depth below ducer, depth below keel, and depth below waterline, but these are fixed amounts in feet, not a percentage. Look at the transducer when it is operating, boat angle considered.

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Installation furuno GP7000F/NT


This unit has built in sonar, so no DFF1 is required. The 1KW transom mount is in stock here, with the proper Furuno 10 pin connector. That is all you need, the display, the power cord, the GPS antenna, the transducer and THE BOOK! We are a Furuno dealer in the Great Lakes

Mar 03, 2008 | Furuno GP7000F/NT GPS Receiver

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Navman 4150 fishfinder


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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2 Answers

Depth finder problem


The problem is not so much the flat bottom, although they are prone to this problem. The way the sonic waves have to travel through the water is affected by turbulence, especially by air bubbles and cavitation, and by the transducer actually leaving the water, which happens frequently on flat bottomed boats. The best solution to this is to have the unit mounted through the hull so it is completely flush with the hull surface - often they are mounted with a surface flange on the outside of the hull which although thin still causes cavitation around the transducer at higher speeds. about 14 knots will usually interfere with the accuracy of the readings on most hull shapes - forward looking sonars perform usually better. Another thing to check is that the transducer is actually seating right in the housing, if it is not flush with the flange then you have problems - even half a millimetre is too much. check no muppet has painted the transducer with antifouling paint - that never helps, also check if there is a build up of marine growth on or near the transducer - a smooth hull will always keep your depth working until a higher boat speed. if the transducer is growing stuff itself then gently scrape it off - be really careful not to scratch the surface. There are now available non-sonic depth sounders, especially ulf radio signal devices, but I have heard no good reports about them, last i saw they were very expensive and maybe they experience other problems at high speed. there also have been towed devices available that may suit your needs better, although probably a lot of trouble in shallow waters. If you can borrow a waterproof video camera, you could mount it behind (not too close) the transducer, this would be a pain to do, but it may give you an insight into what part of the hull if any is causing the problem (tie the camera to the top of the boat securely in case the mount fails) Hope this helps, sorry but your dealer is not totally wrong :)

Sep 25, 2006 | Lowrance M68C GPS Receiver

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