Cheers for the responses all
Maybe I should have given a bit more info, so as not to sound so vague.
My question isn't really a big deal on line, as some of you point out, as we have the toys; radar, GPS, GNSS, FMC etc.
I was asking more in the context of a sim ride, whilst on raw data or the likes - has happened to me a few times where I would have liked to have known how far I had to go, esp on a non prec.
I know that sine of the angle off x the distance works for a right angle intercept, but 'fraid I can only do a rough guestimation when in the above scenario as it doesn't take much to overcook my grey matter.
So hence was wondering if the 1 in 60 method was easier in respect of a quick mental calc whilst in stress mode.
miserlou if the calc only works for perpendicular intercept, thats fine for me....
compressor I like it, cheers
Thanks