The EME instruction to install the "NAVIGATIONAL SET, Land Vehicular, C1" in the M38 is dated July 1963. My copy came with several other EME instructions M38 and M38A1. There wasn't a similar instruction for the M38A1 in the bundle. I don't know whether that was because it was never done (obsolete???) or if the same instructions were used (seems unlikely as there were other mods where separate sheets existed).
The NSN for the Nav set was 6605-21-111-1843.
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