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Author Topic:   Lowrance LGC-3000 antenna problems
hunter7x7 posted 03-13-2010 01:49 PM ET (US)   Profile for hunter7x7   Send Email to hunter7x7  
Last summer I bought a 2004 Lund 2025 that had a Lowrance LCX25C at the helm and a LMS-520C up front at the bow trolling motor. These units were hooked up when I bought the boat so I have no idea how it was wired. Both GPS antennas are Lowrance LGC-3000 models.

Late last summer I started getting a "No Signal Found" on the LCX-25C unit at the helm. Sometimes it would go away, sometimes it wouldn't. Now I always get this message no matter how long I leave it on. Sonar still works fine.

The LMS-520C unit at the bow gave me the same message from time to time last summer but always seemed to connect after a couple power down/power up functions. Now this unit also gives the "No Signal Found" message probably 8 out of 10 times I power it up.

I have unscrewed the top covers off to make sure I wasn't dealing with a loose wire or something like that. I have no knowledge really about installing, wireing or troubleshooting GPS units. Is it possible both of these tanked and need replacing? I am unsure what to try and where to start. I would rather not take it to the dealer because of the cost and I have been out of work for 7 months. Any help or suggestions would be much appreciated. If it would be easier to comunicate via phone I can be reached by phone @ (989) 859-9431.

Thanks in advance for your time and help.

SJUAE posted 03-13-2010 02:56 PM ET (US)     Profile for SJUAE  Send Email to SJUAE     
Have a look at this thread as it seems there was a problem with some of the LGC-3000 182423-anyone-else-having-problems-lowrance-lgc-3000-antenna.html


Jefecinco posted 03-13-2010 07:11 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     

You should call Lowrance on the toll free number in the manual. If you don't have a manual one can be downloaded from the Lowrance web site.

They have been very helpful when I've had an issue with my LGC-2000 the predecessor to your LGC-3000.


jimh posted 03-13-2010 08:24 PM ET (US)     Profile for jimh  Send Email to jimh     
LOWRANCE has had a history of problems with their GPS receivers in the LGC-x000 series. If LOWRANCE were Mercury Marine, we would just say they got a bad run of parts from a vendor, and that would be the end of the discussion. When LOWRANCE gets a bad run of parts from a vendor, however, people on the internet start a JIHAD AGAINST LOWRANCE. You need to think of LOWRANCE more like Mercury Marine. If there is a problem with a Mercury engine, the usual explanation is that Mercury got a bad run of parts from a supplier, Please apply this same sort of thinking to Lowrance. Lowrance is to be held harmless. The blame goes to their supplier for sending some bad parts to them.
jimh posted 03-14-2010 09:08 AM ET (US)     Profile for jimh  Send Email to jimh     
On a modern GPS receiver there really are no user serviceable parts. As mentioned already, about the only user service to perform is an inspection to see if there is any loose connection.

I don't know why the Lowrance LGC-x000 series has had so many problems in the field. The two explanations proffered are: failure from operating in close proximity to a RADAR transmitter; and, failure from static electricity discharge from triboelectric effects from a boat cover.

While there have been reports of problems with the LGC-x000 series, in many cases the devices have been replaced under warranty by Lowrance or at a reduced cost. Whether or not a six year old device would be replaced or whether the second hand purchaser would receive an extended warranty are questions left to Lowrance.

Also, I do not think you need two GPS receivers on your boat. If the two chart plotter devices are connected to a NMEA-2000 network, you should only need one GPS receiver. A single GPS receiver can send data to all other devices on the network.

davej14 posted 03-14-2010 09:19 AM ET (US)     Profile for davej14  Send Email to davej14     
If you are on a NMEA network you should have a power switch for the network. When the head unit reports that it cannot find the antenna signal, try power cycling the network without shutting off the head unit. That worked for me with an LGC-2000 antenna. Last year I installed the latest software upgrade to the head unit and since that time I have not had the problem.
jimh posted 03-14-2010 03:11 PM ET (US)     Profile for jimh  Send Email to jimh     
Dave makes a good point. In some software systems, the order in which devices are started can affect the outcome. If the GPS data is not available when the chart plotter is started, the chart plotter may assume there is no GPS available and never look for it again.

There are also many possibilities for other hardware problems with interconnection of devices on a NMEA-2000 network. Poor network wiring, poor termination, poor power conditioning--all can affect devices.

An error message of NO SIGNAL FOUND is not particularly clear to me. It could mean that the GPS receiver has not been detected by the chart plotter. Or, it could me the GPS receiver is not able to receive any signals from GPS satellites. In that case, the problem could be related to the time, date, and location setting in the receiver. A GPS receiver needs to be seeded with the date, the approximate time, and an approximate location in order to look up what satellites may be in view. If the receiver cannot deduce what satellites are in view, it may take the receiver a long time to find any one satellite.

Lowrance generally has a software utility for setting the date, time, and location of the receiver in order to reduce the time to detection of a satellite. Make sure you have properly configured the receiver.

hunter7x7 posted 03-14-2010 04:52 PM ET (US)     Profile for hunter7x7  Send Email to hunter7x7     
OK, here we go with the information I was supposed to look for.
The LCX-25c has the following:
No NMEA 2000 or BUS Setup that I can find
Software Release 1.1.0
Build: RM3845D

The LMS-520c has the following:
When I go into the NMEA/BUS setup it opens another screen and it says there are no network items found.
Software Release 2.4.0
Build: LN8455F

Also I did not remember the error message I was getting correctly. I really hope I did not lead us on a wild goose chase but the correct error message I get was "GPS Module Not Responding.

So after all this, I assume I should google to find the most current software available for both of the units and start there. Download the latest revision, save it on a card and plug it in to the unit and hope it autostarts to load the new software. Has anybody done this before? How difficult is it?

Again thanks for any help you could give me and to those who have already replied and tried to help.

Jefecinco posted 03-14-2010 06:48 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     

Yes, and call Lowrance.


jimh posted 03-15-2010 08:36 AM ET (US)     Profile for jimh  Send Email to jimh     
An error message of GPS MODULE NOT RESPONDING probably indicates a dead or unresponsive GPS receiver, and not a problem with time or date configuration.

Since you have two chart plotters and two GPS receivers, try swapping them around. Use a GPS receiver on the other chart plotter.

davej14 posted 03-15-2010 07:51 PM ET (US)     Profile for davej14  Send Email to davej14     
Latest software from the Lowrance site:

LCX-25C = 2.1.0 dated 9/20/07
LMS-520c = 2.5.0 dated 7/29/09

Be sure to read and follow the installation instructions. In my case I had to download and install updated software for my LCS-2000 antenna BEFORE doing the upgrade for the head unit to maintain communication with the antenna after the upgrade. As I recall these instructions were in the documentation for the head unit upgrade and no where else. By following the procedure it was successful and I had no problems.

Here is my original post regarding the upgrade:

hunter7x7 posted 03-17-2010 08:20 PM ET (US)     Profile for hunter7x7  Send Email to hunter7x7     
I have tried to download the updated software version for the LCX-25c unit but it gets to 13% complete and locks up. Tried 3 times on 2 different computers, no luck.

Anyone else able to download this updated software?

jimh posted 03-17-2010 09:10 PM ET (US)     Profile for jimh  Send Email to jimh     
I am certain that thousands of people download updates from Lowrance all the time. I have myself a couple of times.

What is the precise URI you are trying to access? Post the URI and I will be glad to try accessing it and will report on the results.

jimh posted 03-18-2010 08:22 AM ET (US)     Profile for jimh  Send Email to jimh     
If the file from Lowrance you are trying to download is

I just tried to download it. It downloaded in about three seconds. No problem. I hope this helps.

SJUAE posted 03-18-2010 03:25 PM ET (US)     Profile for SJUAE  Send Email to SJUAE     
I could not of Jim's direct link but no problem from the web page link and it's only a 8mb file my HDS update was 310mb and was not a problem


jimh posted 03-18-2010 03:45 PM ET (US)     Profile for jimh  Send Email to jimh     
The hyperlink given above should work now.
jmorgan40 posted 06-14-2011 04:02 PM ET (US)     Profile for jmorgan40  Send Email to jmorgan40     
I followed this thread over a year ago. Like you I have never had nothing but good experiences with Lowrance Customer service. Well last week on a fishing trip to Florida, my LGC-2000 was fried when I trolled around a Chineese freightor. Good news is I caught some nice Kingfish. When I returned to Atlanta I called Lowrance and got a CS representative with no hold time at all. They offered to replace with the newer LGC-4000 for $112. Substantially less than the retail price of $269. The only issue was they needed the serial number of the old unit. Stopped by the boat last night on the way home. Removed the old unit. Called this morning and again got an agent with no hold time. Gave them the serial number and they were shipping me the new unit today. I think that is pretty good customer service in my book. I am sure you agree.

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