question

The gate lat/lon are offsets in metres from the airport lat/lon.

I was doing this for gate ident... but I ignore some of the data as you can see...

edit: also see the asobo-vcockpits-instruments\html_ui\Pages\VCockpit\Instruments\Shared\FlightElements\Waypoint.js code.

private static letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

... snip ...

// values less than 12 are gate types, which we don't care for... 12 or greater are alphabetical chars which we do care for
const prefix = msGate.name >= 12 && msGate.name < 38 ? MsfsMapping.letters[msGate.name - 12] : '';
const suffix = msGate.suffix >= 12 && msGate.suffix < 38 ? MsfsMapping.letters[msGate.suffix - 12] : '';
const ident = `${prefix}${msGate.number.toString()}${suffix}`;