Never before has a a GMT movement been used in conjunction with a split timing bezel, counting down then up from mission start over a duration of 24 hours. So original is it’s functionality it has been granted a patent.
Countdown to an event less than 12 hours in the future:
Align the ‘H’ on the internal rotating bezel to the time that the event starts.
The number of hours until the event starts can be read directly off the scale on the inner bezel in conjunction with the tip of the 24-hour hand.
Illustration shows approximately nine hours until event start.
To count up from an event:
Align the ‘H’ on the internal rotating bezel to the time that the event starts.
The number of hours since the event has started can be read directly off the scale on the inner bezel in conjunction with the tip of the 24-hour hand, to a practical resolution of 30 minutes.
Illustration shows approximately two hours since event start.
The 24-hour hand can be set to local time or to a second time zone and the internal bezel aligned accordingly.
To countdown to an event less than 60 minutes in the future:
Align the triangle on the external rotating bezel to the minute that the event starts.
The number of minutes until the event starts can be read directly off the scale on the outer bezel in conjunction with the minutes hand.
Illustration shows T-minus 51 minutes until event start.