aerofiles
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TZO / TZN
https://github.com/Turbo87/aerofiles/blob/61c0de5cdf870d7feb5cafbdc677c93b750a0e12/aerofiles/igc/reader.py#L351
uses TZO as Two Letter Code but such TLC doesn't seems to exist in IGC specification http://www.ukiws.demon.co.uk/GFAC/documents/tech_spec_gnss.pdf