Quadrantal Rule

[ShyTorque]

UK military often broadcast the TL as an increment of 500ft.

[tmmorris]

And when the pressure's high, it's often 'transition level 25', too!

Tim

[Spitoon]

For example in Poland - the trasnition altitude is 6500ft AMSL and the transition Level is FL80 unless the QNH is 995 or less when it is FL90.

Or, presumably, FL100 if the pressure falls below 960 hPa or thereabouts.....