Can confirm, when I fly I use a GMT to keep track of Zulu (Greenwich Mean Time), which is the universal time zone for air traffic and the other for local time of my homeplate (recovery base). I have some world timers but I rarely have a need to track more than 2 time zones simultaneously.The GMT Master was designed for Panam Boeing 707 pilots to keep track of multiple timezones when doing trasatlantic flights. So yeah its a pilots watch and extremely usefull for pilots. You cant do any flight calculations on it but its still a pilots watch in my opinion.
https://www.fratellowatches.com/fasten-your-seatbelts-rolex-gmt-master-history/
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