Originally Posted by
On Track
Prop swinger, it's not a question of choice. The law requires me and everyone else to fly on QNH below the transition altitude (which is 10,000 feet across the whole country). The safety benefits for aircraft separation, when everyone is using a common datum in both controlled and uncontrolled airspace, should be obvious.
That's not the law over here, I have choices and will use them where suitable.
Standardised altimeter settings only makes sense when combined with the semi-circular for cruising flight. When I'm using QFE I won't be in level flight so cruising levels & the associated common datum don't apply.