agree with PBY
I agree with PBY and his views. The very idea of non precision approaches almost demands a few ''aids'' like the 300 feet per nm (closer to 316 feet, but close enough) and the rule of five times your ground speed to give you a 3 degree glideslope descent rate...5x140=700 fpm.
I learned these rules from two of the best...DP Davies and an authhor named WEbb. Their books, "handling the big jets", and "Fly the Wing" should be mandatory for any ''jet pilot''.
the trouble is these books are both over 40 years old and too many modern pilots can't be bothered with the old reliable ways.