Question about Garmin Gpsmap 498, External Antenna With Dual Frequency Transom Mount Transducer
I turn on my garmin gps map 498 and it powers up normally and pages through all the menus ok but will not acquire the satellites even after 20 minutes. This is the model with the internal antenna and its out in the cockpit. Any suggestions?
Posted by Anonymous on
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Posted on Jan 02, 2017
The "New Location" fix above brought my GPS 60 back to full operation. I did reload the GPS software from Garmin but the recovery depended on well charged batteries and as above: turn the unit on
press MENU button
scroll to "New Location"
wait 10 minutes for the GPS to recover.
Posted on Apr 02, 2008
You need to do an auto locate. This also corrects your time issues (wrong date and/or time will be corrected. To do an auto locate do the following.
Posted on Nov 24, 2008
There is a known hardware bug in the Garmin 600 series relating to the detection of the connection of an external antenna. The GPS is supposed to do this automatically and when it detects an external antenna plugged in it switches out the internal antenna. Unfortunately, this circuitry doesn't work correctly in some versions of the unit and sometimes it get's comfused and thinks there is an external antenna connected when there is not. This causes the behavior you describe because, for all practical purposes, there is no antenna connected.
Garmin can fix this and they've been known to fix it even on units that are out of warranty. There is a fix that can be done by someone with the right equipment and know-how which requires disassembling the unit and bypassing the antenna switch. Not to be attempted by anyone not experienced in micro surface mount PCB re-work.
Posted on Dec 07, 2008
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