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Garmin 178c Locks up in shallow water

Old 09-05-2006, 07:16 PM
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Default Garmin 178c Locks up in shallow water

My 178c sounder/GPS has a problem with the depth on the sounder locking up at a reading of 2.9 feet when I get into shallow water (about 5-7 ft.). It doesn't happen all the time but most of the time. I have to turn the unit off and back on in order to get it to read again. I use this on a lake that the max depth is 40 ft and the average depth is about 15 ft deep so as you can imagine this lock up problem is quite annoying. Any help will be appreciated. ;?
Old 09-06-2006, 10:12 AM
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Default Re: Garmin 178c Locks up in shallow water

Have you updated the firmware in it? Garmin lists at least one issue that might be fixed with the sonar on that unit:

Fixed a potential problem associated with the Bottom Lock span feature.

They don't provide more detail on the download page but it might be worth doing to see if it will correct the problem. I've got an issue with my 498 where it loses bottom lock in shallow water and won't reacuire unless you start moving again. They have several sonar issue fixes for my unit in firmware updates but I haven't updated it yet.
Old 09-07-2006, 09:42 AM
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Default Re: Garmin 178c Locks up in shallow water

I read through the updates and didn't seem to think there was anything in regards to this issue. It is a fairly new unit but I know it is about 1 update behind so I guess I will give it a try.
Old 09-07-2006, 12:01 PM
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Default Re: Garmin 178c Locks up in shallow water

I have the same problem when the range is set to Auto. In shallow water it will get locked up in the clutter it reads for the first few feet under the boat.

Changing the range to a fixed depth takes care of the problem. Zoom out far enough to show the true bottom and it will go back to operating properly.

I have tried adjusting the gain and noise settings, but don't hae the difinative answer on what settings work. It is easier for me to just change the range until I can see the bottom.

-Joe
Old 09-07-2006, 07:11 PM
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Default Re: Garmin 178c Locks up in shallow water

Thanks Joe, I will give that a try this weekend and see if it works.
Old 09-07-2006, 10:19 PM
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Default Re: Garmin 178c Locks up in shallow water

Thanks again Guys for the valuable information. My 178C behaves in precisly the same way and the same depth as Renoman's. I too will be all over the range change next trip. Regards, Joseph
Old 09-08-2006, 06:36 PM
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Default Re: Garmin 178c Locks up in shallow water

Got the same issue with this unit. In Deep, good suggestion on the settings, will try that this weekend.

Old 09-11-2006, 12:36 PM
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Default Re: Garmin 178c Locks up in shallow water

OK, I tried changing the range from auto to a fixed depth and nothing seemed to work. It still locks up at 2.9 ft. and needs to be shut off and turned on again to read the depth properly. Anybody have any other suggestions? ;?
Old 09-12-2006, 07:06 PM
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Default Re: Garmin 178c Locks up in shallow water

Have you guys had any luck fixing this problem?

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