Yeah... I was a bit confused about that..... Can`t remember the exact distance from Duncan that they "found" this russian ship... but... surely it was showing on satellite surveillance back in the U.K. most ships have a system of identification, called A.I.S. which gives the ships position on a chart, its course and speed.... true... it can be switched off... but even so, one would expect the R.N. to have a radar capable of picking up ships within 25 miles before the curvature of the earth took effect.
The warnings to the russian pilots to stay 2 miles away from the advanced radar, was, I think, a bit of hocum pocum... as they are not likely to heed that warning... ( probably because they have been tasked to do, whatever.... ) and the warning did not give a reason why... It could damage your electronics and navigation systems... even so, I think I remember someone on the bridge stating that they did come within 200 yards of the ship on the beam... and still managed to fly away in safety..
The russian pilots were obviously testing and probing, gaining intelligence, in just the same way as the Duncan was with the "spy ship"... it was a god given chance for them to find out about our most up to date warships, and what technology we employ... !
