I guess you guys never learned to use this? This was part of the Table of Equipment for HC H-46's up through the mid 90's I think. Your very last self-paced academic lesson in the FRS as a CAT I was on using the MK 6A plotting board. Film strip and audio cassette. We universally blew off the lesson, got the gouge for the test problems and called it done.That reminded me of my last deployment. Various functions would just get turned off for no reason. Everything aviation-related would break, as well. Flight deck lights would go out and we never had HAWKLINK the entire deployment (it was the ship, not us...big surprise). That's like not having a HUD in the Hornet. You can technically still fly, but all of the integration goes out the window and you basically just operate by yourself, hoping the ship would be able to find you if you ditched (spoiler alert, they won't).
Eventually the TACAN caught fire and completely died. I think at that point it became day time only, 20nm radius patrols. That ship was a clown show.
The MK6 was in every aircraft - in the Nav bag that Ops maintained and kept updated - whether forward deployed or home guard.
But because having the MK6 technically meant we had an OTH "all weather" capability, we frequently did just that - with the fleet at EMCON with only "pigeons". 100 miles legs blue-water wasn't uncommon, with just barely enough gas to get back to Mother. UHF DF and other tricks helped. (A/A TACAN from other aircraft thanks to the updated AN/ARN-118(V) TACAN that we received as part of the SR&M update in the late 80's)
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