Author Topic: Our 998c SI unit does not get a GPS connection  (Read 624 times)

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Offline DiveWinnipesaukee

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Our 998c SI unit does not get a GPS connection
« on: July 31, 2021, 08:55:04 AM »
We have a 998c SI unit.  It is 9 yrs old.  Last year a couple of times the GPS would not connect. That problem was solved by disconnecting and reconnecting the connection wires at the rear of the unit.  This spring the unit connected to GPS once or twice but now will not connect at all.  The plotter works and I can see underwater wrecks but we have no GPS data. We also have lost our map of Lake Winnipesaukee but I know that's because of no GPS connection and we do not use a separate SD-card map. Obviously we also have lost boat speed indicator due to no GPS.  In the winter, our boat (which has a covered cabin) sits outside.  The 998c SI unit is removed from the boat and sits inside.  We have several boat captains who all use the 998c SI but I have the most experience using it. I know the other boat captains "play" with the unit and I suspect we may now have some settings that are out of whack that may be causing our problems.  Any help would be deeply appreciated.  Thanks. 


Offline rnvinc

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Re: Our 998c SI unit does not get a GPS connection
« Reply #1 on: July 31, 2021, 09:10:52 PM »
Test your unit on someone else’s boat to determine if the issue the head unit or the GPS puck  ...

I think your 998 came with the AS GR50 GPS puck and it is no longer on the Humminbird flat rate repair list  ...
https://www.humminbird.com/support/faqs/RepairFees

If you verify the GPS puck is defective on someone else’s boat call HB to verify that the newer AS GRP will work on your 998  ...

1-800-633-1468

Rickie

Offline DiveWinnipesaukee

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Re: Our 998c SI unit does not get a GPS connection
« Reply #2 on: July 31, 2021, 10:50:30 PM »
Thanks for your suggestion.  I know a guy who has an 1197 unit.  Will his connection plug also connect to our 998c SI?

Offline rnvinc

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Re: Our 998c SI unit does not get a GPS connection
« Reply #3 on: August 01, 2021, 10:23:50 PM »
Thanks for your suggestion.  I know a guy who has an 1197 unit.  Will his connection plug also connect to our 998c SI?

Yessir 998 and 1197 both have the same GPS cable connection  ...

Rickie

Offline DiveWinnipesaukee

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Re: Our 998c SI unit does not get a GPS connection
« Reply #4 on: August 01, 2021, 11:45:18 PM »
Pictures of rear of HB1197 and HB998c SI attached.
I must be missing something.
The connections look totally different.

Offline rnvinc

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Re: Our 998c SI unit does not get a GPS connection
« Reply #5 on: August 02, 2021, 11:01:21 PM »
Pictures of rear of HB1197 and HB998c SI attached.
I must be missing something.
The connections look totally different.


The plastic cable “collectors” are different  ... the individual cables are identical  ...

Take the collectors apart and switch the plastic collector (for your 998) onto the 1197 cables  ...

Or plug the individual cables into your 998 for testing  ...

Rickie
« Last Edit: August 02, 2021, 11:02:44 PM by rnvinc »

Offline DiveWinnipesaukee

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Re: Our 998c SI unit does not get a GPS connection
« Reply #6 on: August 08, 2021, 09:14:18 AM »
Hooked up our cables to my friend's 1197 and NO GPS position data.  I'm assuming my antenna & cable are bad.  As a last resort, I upgraded the unit software from 5.7 to 7.670 hoping that might be the connection problem but no luck.  As a final test, I need to travel down to my friend's house and hook my unit up on his boat and antenna to see if my unit works.

I did call Humminbird and they said that the 998c SI has been retired and that new antennas for that unit ARE NOT AVAILABLE.  Our antenna is an AR GS50. Can this really be true?

Offline rnvinc

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Re: Our 998c SI unit does not get a GPS connection
« Reply #7 on: August 08, 2021, 08:56:17 PM »
It is correct the AS GR50 has been dicontinued  ...

The newer AS GRP shows as compatible  ...
https://humminbird.johnsonoutdoors.com/accessories/boat-navigation/grp-external-gps-receiver

But it may be unavailable (at HB) due to supply chain problems from the virus  ... many reports of guys waiting months for units  ...

Check other online sites for availability  ...

I’ve even found some Humminbird items at Walmart.com  ...

Rickie
« Last Edit: August 08, 2021, 08:59:52 PM by rnvinc »

Offline DiveWinnipesaukee

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Re: Our 998c SI unit does not get a GPS connection
« Reply #8 on: August 11, 2021, 10:53:28 PM »
Finally got around to hooking my 998c SI to someone else's AS GR50 antenna and my unit worked perfectly.
We ordered a new AS GRP antenna today.
Rickie - Thanks so much for all your helpful information.

Offline DiveWinnipesaukee

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Re: Our 998c SI unit does not get a GPS connection
« Reply #9 on: August 24, 2021, 11:59:41 PM »
Received and installed a new AS GRP antenna and we're back in business.

Offline rnvinc

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Re: Our 998c SI unit does not get a GPS connection
« Reply #10 on: August 25, 2021, 09:30:41 PM »
This is good news  ...

Rickie


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