I don't own a Doxa, but I am tempted by the GMT 750T Caribbean. I have looked at GMT watches from several manufacturers and I see that they work two different ways with regard to setting the time. In my opinion, the right way is that the GMT hand remains stationary when you set the regular hour/minute hands. The wrong way is that the GMT hand moves at the same time when setting regular hour hand (half as far).
My reasoning is that the if I fly from Las Vegas to New York, and I land at 11 AM, I need to move the regular hour hand from 8 to 11. However, GMT did not change. It is still 15:00 GMT.
I've found that the only brands that do it the way I want are Rolex, Omega and Blancpain. The others I've tried, like Breitling and Sinn do it the other way.
So, how does Doxa do it?