I never did get the helm unit GPS working however now I don’t have to worry about it I guess. Approx. 2-2.5 weeks ago, someone stole both the bow unit and the helm unit so now I don’t have any Lowrance units to worry about. They were even kind enough to take 6 rods and 7 tackle trays full of lures to make sure I didn’t spend too much time fishing this spring/early summer. Now I have to run the insurance gauntlet and maybe by fall, I can get fishing again. What a way to start out the season.

Congrats.

I looked for fuse issues yesterday. With all the wires tucked away and running together it was hard to determine exactly which wires were for what. I did check a total of 7 fuses and everything was OK. After that I took the antenna that works at times off the LMS-520c and put it on the LCX25c that I can never get the GPS antenna to respond. Even with the “good” antenna I still got the dreaded “GPS Module Not Responding” message. However the other antenna did work on the LMS520c. Now I am not sure what to try next. I have emailed Lowrance customer service twice and even submitted my problem with their website “Customer Service” portion of their website. I called twice, after being on hold for over an hour each time I finally had to hang up assuming nobody was coming to help me. Surprisingly after contacting them 3 additional times online in the last 2 weeks, I have not heard a peep from them either. If by some chance I have to replace even one of these units, I promise it will NOT be another Lowrance product. I have never been so disappointed in a company’s customer service department (or lack there of) and vow they will never get a single $ from me.

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
STV:1.0

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.

I guess I am not sure. How can I tell which network each of them are on. If you can let me know, I will go out and double check the network settings.