Question about Garmin GPSMAP 498 Fishfinder / Chartplotter GPS Receiver

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How do I eliminate the flashing question mark over my waywawrd triangle on my Garmin GPSMAP 498 chartpl;otter reciever?

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6ya6ya
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Posted on Jan 02, 2017

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reef runner
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SOURCE: Garmin GPSmap 76 not acquiring satellites

I had the same problem? GPSmap76S was hung up trying to AutoLocate. It just couldn’t find itself, and it just stopped working all of a sudden one day, while I was traveling. I spoke with Garmin about the problem, and they advised me of an ongoing problem with WAAS. I was told that I should "Disable" WAAS, because the signal from the WAAS satellites had been changed by the government, and Garmin had not yet put out a software update to address the problem, on the 76 units, anyway. Also said that an update "should" come out, in the future, however, no commitment or promise on that. Evidently, once your unit hits one of the WAAS signals, it scrambles up the receiver in the GPS, because mine sure went crazy. The support guy also said, that if this did not correct the problem, I might also want to try a "Master Reset". So here’s what happened.
I disabled WAAS, but this did not correct the problem. The unit was still lost out there somewhere, trying to AutoLocate, so I ended up doing the “Master Reset”. Please read up on this procedure before trying it, and understand that you “will loose” any settings that you might have made to the GPS, along with all waypoints, routes, tracks, etc., however, my maps actually remained in tact? This procedure will actually set the unit back, just as it was when it originally came from the factory. Once completed, you will then have to allow the unit to initialize it's self again, just as you did when the unit was new. If you have forgotten about doing that, it simply means that you need to set the unit outdoors and leave it “on” for a while (15 – 20 minutes), until it actually AutoLocates it’s self, or locks in on your current position. Once this is done, re-do your setting preferences, back to the way you had them before the Master Reset. At the very least, you’ll have to re-set it to the correct time zone, and tell it about daylight savings time. Note: It’s a very good idea to go thru first, and jot down your page settings and main menu settings, before doing this procedure, or the screens may not look familiar to you, once the unit resets. You think you’ll remember them all, but you won’t. But whatever, once you have done the “Reset” and “Initialization”, you must now hook the GPS up to the computer and reload your waypoints, routes, etc, back to the GPS. You did have them saved on your computer, didn’t you? Hope so… If so, you should now be good to go…………….
My unit now works like a champ, good as new, just not as accurate, due to WAAS being turned off. I still don't know if the WAAS issue, was part of the problem or not, but I do know that the Master Reset got the unit back to working immediately, allowing it to locate itself almost instantly. What a relief…………..it’s a little work, but it takes much less time than it took you to read this post…………..
Hey, when all else fails, call Garmin 1-800-800-1020. They are good guys and willing to help, in fact, I would advise you to call them before you do anything, so you can describe to them, exactly what your unit is doing. I am only relating my situation and what happened to me. Your situation may be different…….

Posted on Dec 13, 2008

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SOURCE: I have a garmin gpsmap 498, 4 yrs old. I have been

Had same problem,,, you need to perform an "Auto-Locate" With unit plugged in but not turned on, push the Page and Power buttoms at the same time,,, continue to hold down the buttons until the "I Agree" message appears. Then release the buttons, agree by pushing Enter. The system will then go through an Auto Locate sequence that corrected my problem.

Posted on Sep 02, 2010

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Did I understand this right, you do know how to replace the backlight, but you cannot locate it inside the unit ? Try to look here: http://goo.gl/6hCS

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Power off the Garmin unit. Press on continuously the upper top left corner of screen and then power on the unit by pressing once on the Power button. You should be prompted to clear all user data, or asked if do you really want to start up in maintenance mode. Press "Yes" to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode. I hope this helps. Good luck

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My positioner arrow shows a question mark blinking in top and doesn"tshow my position, I all ready change the anntena and the problem persist


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kdog

Dec 29, 2010 | Garmin Gpsmap 498, External Antenna With...

1 Answer

How can I download a manual for a Garmin Gps 498


Here's the link to download the manual for free. If this solves your problem, please come back and rate our solution.
https://buy.garmin.com/shop/shop.do?pID=370

Jul 31, 2009 | Garmin Gpsmap 498, External Antenna With...

1 Answer

Can an external antenna be added to Garmin 498


Hi
Sure you can use an external antenna.
Here it is
It is however really only useful to allow for decent veiw of satelites when the unit is monuted under a the signal shadow of a cabin or below decks. Any GPS will not perform as well if a decent shot of 3 or more satleites is not acheived. I suspect this is what is hampering your device. Using the external antenna mounted to get maximum view of the sky will eliminate any such issues for you.
Please take a moment to rate this solution. heers
regards robotek

Jul 15, 2009 | Garmin Gpsmap 498, External Antenna With...

1 Answer

Garmin gps 498.


I have the same exact problem, but i don't have a solution

Mar 24, 2009 | Garmin GPSMAP 498 Fishfinder /...

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Garmin 498 - trouble finding satellites


Push power/menu together or power/page together. the whoole unit will reset. you will lose all saved data but this may help

Nov 07, 2008 | Garmin GPSMAP 498

1 Answer

Depth display


reset your factory settings!

Oct 02, 2007 | Garmin GPSMAP 498

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