What's the FL over oceanic tracks?

#1

So whenever I plan a flight thru simbrief, it always tells me to fly at an odd numbered flight level regardless of the direction. I just want to ask if this is an actual irl procedure? This isn’t a very urgent matter, i just want to discuss. hehe.

#3

Yea, the NATS have different altitudes that don’t necessarily conform to the east/west rule. Simbrief is correct.

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#4

Here you go, current updating NATs from the FAA:
https://www.notams.faa.gov/common/nat.html

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