....how you would use such gear when approaching, say, a FAF in the sandpit at night or in bad vis.
....VERY SLOWLY, OR NOT ALL!!!
Bearing in mind that even the VOR/ILS was not even cleared for use, I certainly would NOT have trusted CPLS/PRC112! (+/- 4 deg is an awful lot of room for error when near culmulo-granite and cloud - that's before you consider any possible EM interference - testing for which had NOT been done in '94.)
In short, the Hc2 was, at that time, a
"Day, VMC, Op Necessity only" aircraft.