Originally Posted by Farmer 1
On the other hand, you would presumably set airfield QNH and set off into an area of lower pressure. Immediately, your altimeter starts overreading, and your safety margin is reduced. Not by much, I grant you, but by a finite amount, while mine has increased. And how often are you going to update your setting, or more importantly, just how, if you lose VHF coverage?
Safe flying.
No - I'm either going to a) follow the procedures I've stated before before or; b) Be flying IFR iaw with Flight Levels ( a more sensible arrangement when the UK Transition Altitude is mainly 3000ft).
I'm sorry - the argument doesn't hold up. You still haven't addressed the problem of how you're going to obtain the RPS. Your "Setting off into a depression" scenario, with reference to altimetry in the UK scenario, is a throwback to flying 80Kt cruising speeds in IMC in a UK of many years ago - not today where better solutions and options are available.