Ant T
Yes, I agree, it was 0.45nm. When we had one of those green coloured RCA Primus 45 Radars, we wondered how technology could improve any more. Then came the Primus 500 colour radar with the grid lines, we couldn't believe our luck!
Hand flown approaches in the S-61 down to 150' rad alt and 0.45nm on minimum diversion fuel, them were the days!