Practicallity, this will work because you can turn the bezel..
By: KC74 : April 23rd, 2011-08:37
..and use it as a GMT function. But just checking, the GMT Master turns half-hourly on the bezel, isnt it, just like GMT II? How does it turn on the Submariner once modified? I like the modification, adds another function on the divers watch such as Submariner, it covers the air and the ocean. Interesting. It looks hybrid.