Common misnomer. People often think it's only height when in fact it's MSD - minimum separation distance (to the uninformed) which amounts to a 'thou shalt not impinge upon' bubble around the aircraft. i.e. laterally as well as below.
However, if you're up the side of a hill and Albert et al is IN the valley, then you'll see it below you.
When we flew low level through Snake Pass in trail, we were looking up at the road. However, we were operating at 250' MSD, ergo, we were legal. I daresay each driver thought we were operating too low - probably where Avitor comes into the equation (unless he's just being a tw*t).
Additionally, there are certain designated areas where fixed wing can go to 150' MSD and helicopters to 50' MSD.
A little bit of knowledge is a dangerous thing . . .
Last edited by Dengue_Dude; 5th Jun 2012 at 19:55.