Author Topic: 987c antenna replacement  (Read 5058 times)

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Offline tstorm87

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  • Location: Cartersville, GA
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  • Unit(s): Humminbird 987c
  • Accessories: GPS
987c antenna replacement
« on: October 19, 2015, 08:59:48 AM »
Hello everybody,

I bought a Stratos bass boat 2 years ago and it came with an older Humminbird unit - the 987c SI/GPS/Sonar combo. Recently, the GPS function has suddenly stopped working. The status says "UNCONNECTED" but I've unplugged everything, looked at the pins, checked for corrosion, etc., but everything looks clean and solid but still no functioning GPS. I am hesitant to buy a new antenna (usually retails around 150 bucks) for a unit that is so old that Humminbird no longer services it. I was wondering if anyone else had any other alternative solutions, suggestions, or tips that may get the GPS back up and running on that unit.

Thanks in advance,

Tstorm87


Offline ITGEEK

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Re: 987c antenna replacement
« Reply #1 on: October 19, 2015, 01:47:57 PM »
If the connections look good, as a last ditch effort, I'd try and
install the latest software, if there is a newer version available than what
you're running.

Offline tstorm87

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  • Joined: Oct 2015
  • Location: Cartersville, GA
  • Posts: 4
  • Unit(s): Humminbird 987c
  • Accessories: GPS
Re: 987c antenna replacement
« Reply #2 on: October 19, 2015, 01:50:39 PM »
Ok great suggestion. I'll do that tonight and I also read somewhere that the battery could be an issue too. Not enough voltage could possibly turn the unit on but not have enough power to turn the GPS on. I'm gonna charge the battery tonight as well to see if that fixes the issue. Since that unit is hooked up to the cranking battery I figured that if the battery can start the motor it should be good enough to run the unit, but we'll see.

Offline tstorm87

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  • Joined: Oct 2015
  • Location: Cartersville, GA
  • Posts: 4
  • Unit(s): Humminbird 987c
  • Accessories: GPS
Re: 987c antenna replacement
« Reply #3 on: October 19, 2015, 06:19:29 PM »
ITGEEK, looks like I've got the latest software update on there. Battery is completely charged. Unfortunately, still no GPS signal.

Offline ITGEEK

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  • Accessories: XM Weather - Weathersense
Re: 987c antenna replacement
« Reply #4 on: October 20, 2015, 07:38:46 AM »
Maybe call Humminbird customer service, and ask if they could send you a GPS receiver to test.  If it works, then you can buy it, if not, maybe you can send it back.

Offline tstorm87

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  • Joined: Oct 2015
  • Location: Cartersville, GA
  • Posts: 4
  • Unit(s): Humminbird 987c
  • Accessories: GPS
Re: 987c antenna replacement
« Reply #5 on: October 20, 2015, 08:21:38 AM »
I unplugged all of the wires (again), took them out of the plastic piece in the back of the unit that seems to just keep all the wires organized (sorry i dont know what that piece is called) and I plugged everything back in without using that wire organizer and the GPS started working again. Not sure which of the steps I took actually fixed the issue but, until further notice, everything seems to be up and running again. All the connectors looked super clean and clear but I may go back in later this week and spray it with some electrical cleaner just to do some preventative maintenance.

Thanks for your help


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