Jose wrote:
Hi Jose. I like your checksum argument. It's two digits for me from now
on, and we should urge everyone to adopt this convention.


It's actually somebody else's idea, though I recognized it as like a
checksum. However, "zero two" and "two zero" can be confused with each
other even when each is clearly heard.

There is another pair: 13-31.

At least here, the combinations 02-20 and 13-31 are avoided
by naming the runway to the next available direction, so it
may be up to 10 degrees off course. An example is Mariehamn,
Aland Islands: the runway is 021/201 degrees, but the naming
is 03-21.

--

Tauno Voipio
tauno voipio (at) iki fi