Question about Garmin Fishfinder 90

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My Garmin 340C fishfinder flashes 00 depth in or out of the water and all the time.

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Hello
More than likely the Sonar transducer has failed. Since Garmin doesn't release repair information to the public you will need to send it back to Garmin for repair or exchange, since the model is no longer sold they will most likely offer you a discount on a newer model of the 340C.. Here is a link to the out of warranty web page of Garmin.

http://www8.garmin.com/support/outofwarranty.html

Posted on May 25, 2011

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Posted on Jan 02, 2017

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Garmin 300c fishfinder will go from correct depth to 0.0 ft while traveling.Have to turn it off and restart. It is on Hurricane deck boat 198. It is located between engine and leveling tabs.


My experience as a user is that turbulence around the transducer can cause mine to flash and the depth to remain static.Is your fault affected by speed? Sounds to me that you have a faulty connection causing the transducer to "not register". I'd check connections and also the integrity of the transducer. Hope that helps...
Best of luck

May 28, 2014 | Garmin FISHFINDER 300C NIC ()

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check your battery voltage. Low voltage can cause errors end prevent the sonar from starting up. If charging the battery doesn't work then contact garmin for a replacement.

Nov 30, 2010 | Garmin Fishfinder 400c With Dual Beam...

1 Answer

Is Garmin Fishfinder 90 working?


possibly.most ive owned will flash random numbers when out of the water.the fact its flashing or reading numbers at all,means its working.youll have put it in water to see how accurate,obviously

Jul 08, 2010 | Garmin Fishfinder 90

1 Answer

I have a gps Map 498-depth sounder not working? Have new transducer from Garmin-it flashes "00"-it is not connected to boat yet (transducer)-need it be or can I put in a bucket of water (need it be in...


If the transducer is out of the water, you will not get a reading and see the flashing depth. You should hear and feel the clicking in the transducer when out of the water and working properly. Are you getting a temp reading when out of the water?

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1 Answer

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I think you need to level the transducer. You have it pointed way out in front of you so that when you're going fast it is able to bounce the signal off the bottom and it comes back to where the boat has traveled to. When you're going slow you're bouncing it out in front of you but it comes back up in front of you. Sorry but I can't find a picture of a Garmin transducer. Hope this helps.

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2 Answers

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Change your setting from saltwater to fresh water even if you fish in sea water,your transducer is a 00/200KHZ and not a 50/200KHZ.
Good luck
Willem

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1 Answer

Garmin, 340c,440s, 420s


You can download them for free at these sites if it helps you.

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http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=31&product=010-00505-00

Garmin GPSMap 420s
http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=30&product=010-00516-22

Garmin GPSMap
http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=30&product=010-00516-42

Oct 08, 2008 | Garmin 340c Fish Finder Dual Frequency...

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