OK, didn't plan a history lesson until next Thursday, but...
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When TC or was it DOT, maybe it was MOT put out their Canada Air Systems Plan (CASP) in the early 80's, one proposal was to blanket all of Canada with VHF/DF. Of course like much else in the two vol. plan, it didn't happen. It is a poor man's radar, but like someone said, very useful tool. Use of has potenially avoided many accidents/incidents. One such story was a late night call on 126.7 picked up by YTH FSS. Said a/c was calling Yellowknife! Duty FSS asked him if he could help as the DF indicated he was NW of YTH and by the sig strength within 50 - 60 miles of YTH. Pilot indicated he was a medevac out of Spence Bay destine for the "Knife. His fuel was down and once he was aware of where he really was, decided to land Lynn Lake. He advised he was on final which YYL advised, "by your bearing, not at YYL your not." He overshot Leaf Rapids and continued on to Lynn. Medevac pax got off and refused to get back on, company asked YYL FSS to have a/c refueled for another pilot who would be there in the morning to take it to YZF. Not sure what the outcome of this would have been without DF both in YTH and YYL.
TC decided that DF was too expensive to maintain and started pulling them out of sites in the 90's. One accident in southern ON was an a/c lost, low on fuel, poor wx and the FSS's in vicinty had their DF's removed. Unable to do anything and with no radar coverage, the poor sod flew until rolling up in bush and rocks, not surviving. Possibly a DF steer might have got him to an airstrip. Of course Ottawa knew best, cost conscientious, I'm surprised that there are still some around.
There were some Regions, YQM for one, that would not allow FSS to perform c/b on the assumtion they weren't smart enough or capabile of steering a/c and most pilots would come out of cloud upside down anyways. Duh, at least with DF he could have come out over the airport or other suitable terrain, at least know where to send CFR. One more story then I'll go, C46 departs YTH, declares emergency, going down, Reg. TC Safety Officer in FSS, commandeers chopper doing a run-up, given last bearing taken on C46, run out and picked up survivours and via direct to hospital. Total time, 30 mins. No DF; would have taken longer to find site. My theory was anything we could do on the ground to aid and assit those in the air was applicable.