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Setting the GMT Master II

S---the second hand.
M---the minute hand.
H---the twelve-hour hand (the typical "hour" hand).
T---the (red) twenty-four-hour hand.
B---the bezel.

The winding stem has four positions.

Position 0: Crown screwed down (default position).

Position 1: Crown unscrewed and just free of the screw threads (for hand-winding).

Position 2: Crown pulled to first notch (makes the H hand move by +/- 1 hour; this does not impact S, M or B.)

Position 3: Crown pulled to second notch (the watch stops, and you can advance M [with H and T hands] as you see fit).

Here is additional detailed information.

How to set B

You don't have to touch the stem to play with the bezel. If your local time zone is negative (you're west of Greenwich), rotate B clockwise by the correct number of hours. If your local time zone is positive (you're east of Greenwich), rotate B counterclockwise by the correct number of hours. If done correctly, T, when read against B, shows the twenty-four hour time in your time zone.

How to set H

When you travel somewhere, set B to the correct time zone. To change H, select position two, and adjust H until the hour is correct (in +/- one hour increments). Note that M, S and T will continue to turn, so your watch will not lose time! Restore position zero when finished.

How to set T and M (and Stop S)

Move B so the arrow is above the crown (B=0). Select position three and adjust T to give the 24h time in GMT, where T is read against B's scale. You'll note that M moves when you rotate the stem, but S stays fixed. (S and M run at every position except three.) When done, restore position zero.

(Select position three and turn the stem until you get the correct time.)

Once you set T, you will never have to change it again, except to adjust for error in the watch---T does not change with daylight savings time, for example.
If the watch stops for a few hours?

In the event that the watch stops for a few hours, pull the stem all the way out (Position 3) and turn the M, H and T hands around until the correct time is re established. If you should jump the hour hand forward (Position 2), then T will be set incorrectly.

How does one skip the date forward?

Put the GMT Master II in Position 2 and it is easy to skip forward as many days as necessary, one hour at a time.

Roughly every other month one has to skip forward a few days because the watch does not adjust for months shorter than 31 days, but this is an extremely quick adjustment.