Ahhh, yeah you're spot on. I've just sat playing with the TGT and it is based on the coords of ground targets designated for bombing, very accurate for the ground, gives wrong numbers for planes. At some point I forgot that the original video said RNG instead of TGT
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You've cleared that up for me cheers. At least this might give some insight into where the differing pilot analysis is coming from (Lehto saying it's just wrong and Lemoine giving the weird trig explanation), simply a confusion between TGT and RNG? It doesn't help that the manuals refer to them both as target range despite being different in where they're used, how they're obtained and what distance they measure.