Quote:
Originally Posted by whifof100ll
"The 296/396/496 have a new bug/feature that always set the magnetic variation from the external data.
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I hate to say "it's a feature, not a bug" but it's a feature, not a bug.
All Garmin handheld units that have ever been able to receive Aviation-format serial data have always had this same behavior, going all the way back to the GPSMap 195, circa 1997. It's intentional that they obey the magnetic variation received from the remote unit, which is assumed to be a certified panel-mount navigator (something like a GNS 430). If you think about it, it should be apparent why this is so.
In the case of the original poster, I'm fairly confident that the third-party EFIS system is responsible for the problem; the 396 is simply using the magnetic variation data it is receiving, as it is designed to do.
good luck,
mcb