Question about Garmin Gpsmap 440s Dual Frequency Combo

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New GPSMap 440 S Depth flashing

Unit flashes depth reading (I swear it is deeper than 2.2 feet!! it was more like 900) while drifting and while running at different speeds, does not always do it but when it does start it seems like it can take up to 10 minutes to clear and start reading correctly again.

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You need to visit the garmin site and download a software upgrade its free and should fix any glitches you may be experiencing with your unit.

Posted on Mar 13, 2010

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Unit will show correct depth for a short time and then reset to 2.2 feet and stay at that reading for long periods of time!


I assume that when it resets to 2.2 feet that the readout is flashing. If so the it sounds like you have a bad transducer as the problem has been getting progressively worse.
The transducer needs to be replaced. Sounds like the sending crystal is fractured.

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get a new transducer or make sure you are not in less than 10 feet of water

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Sound like the transducer is catching air.

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I lose depth when moving


that's common with all depth finders when on plane you loose bottom lock when you slow down to stop does it start to work again if so you have no problem

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1 Answer

Loses the depth after around 60 feet.


Is the transducer face clean? Fouling and barnacles can cause poor depth readings. Also, a low power output from transmitter or poor sensitivity of the receiver (both internal), or a broken transducer cable connection (usually accompanied by heavy noise being painted on screen). With your ear in the water, fairly close to transducer (6-10 ft., you should hear a clear tick-tick-tick sound as it transmits on a medium depth range.. No power adjustment is available in the menus, but the unit does transmit at a slower rate, with wider (stronger) pulses on the deeper ranges.

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1 Answer

I have a garmin gpsmap 440s that will only read sonar depths a no wake speed. When I increase speed much past this the depth number blinks but does not track or change until I slow back down to idle again....


Sounds like the transducer is installed at the wrong angle or in such a way that it is getting a lot of air from something on the hull. If it is a transom mount, check that it is angled correctly and not too close to the motor or aft of some kind of thru-hull fitting that will cause turbulence.

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Eagle 640c Fish Finder dosen't read corectly.


I had the same problem and got the transducer changed. It now works perfectly. That could be the problem you are having... bad transducer.

May 17, 2009 | Eagle Intellimap 640c Marine GPS GPS...

1 Answer

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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1 Answer

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reset your factory settings!

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