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Originally Posted by petespendthrift
In the original post I talked briefly about the GMT2 and some general information on the significance/history of Greenwich Mean Time, Latitude and Longitude and timezones. For nostalgia here is an old ad that is fun and interesting.
A 1961 advertisement for the Rolex GMT in which they specifically talk about it's useful features. The photo shows the Sextant (probably on a Boeing 707) that was used through a periscope in the cockpit roof. An accurate GMT time source is essential for using a sextant as every 4 seconds of time keeping error equates to approximately a nautical mile of inaccuracy. Of course navigators and sextants are no longer used on modern airliners (with IRS and GPS) but a well regulated watch and also a GMT reference is still a very useful convenience both on and off the aircraft.
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A little off topic but that is certainly not a 707. Don't ask me how I know:)