it is merely to locate a subject in possession of a PRC112 or similar
From CPLS documentation..........
"It also provides the capability to home to any continuous wave signal in its frequency range".
Of course that doesn't mean Chinook crews used it that way.
What is more interesting about this post is that there have been constant denials of the existance of this kit (Wacky radios etc), yet now that it has been proven to have been fitted to the HC Mk2 we have moved from "It doesn't exist" to "It does exist, but that's not how it was used". Given the raft of EMC problems MoD noted in the CPLS "release documentation" (such as it was, being totally non-compliant with the regs) one wonders if this is the "Classified" equipment fitted to ZD576 referred to by a BoI witness. (I've asked this before, but it was at a time when CPLS apparently didn't exist). The BoI didn't explore this further. If they did, they would have been forced to consider, very seriously, the possibility of EMI.
As it was, they merely ordered some EMC testing at Boscombe related to, for example, use of mobile phones. The very fact they had to order this after the event indicates it wasn't done beforehand, as required by the Regs. Yet more evidence that the build standard and understanding of the aircraft was too immature to be released to service. And it also indicates a readiness to accept that passengers, who were not permitted under any circumstances to use such mobile devices, could have used them. (And what is the big no-no in EMC terms on any aircraft - interfering with the fuel computers. Such temporary interference would, in all probability, leave no trace). It is seemingly innocuous issues like this which reveal just where the BoI thought there may be problems; equally it is suspicious why they were not investigated further. I'd love to see the unedited BoI report and the members' notes.