Here's a "GPS thingy" in a Humvee
I'm not sure if we are talking about the same things. My GPS is the old school one: Gunner's Primary Sight. I don't remember the model number of the damn thing, I just know it's the big Mother periscope thing that stuck up through the roof of the turret. The secondary sight was called "The Telescope", although I think the books called it a Ballistic Telescopic Sight or somesuch.
I'm not aware of any M60-series tank that mounted a GPS: Global Postioning System antenna, but I could be wrong.
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