Looks like a power/antenna plug from a 1990's Garmin handheld GPS.
Wright Brothers Master Pilot, FAA Commercial Pilot
Aviation Director, Piper Owner Society Forum Moderator and Pipers Author.
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I have a Garmin GPS 90 handheld GPS but it uses a round connector. A GPS antenna connection would be coax, not just a pin in a multiple wire connector...IMHO!
1969 Arrow 200
Based at KFLY (Colorado Springs, CO)
Hi, I think you're right on this.