Blue and GMT go together naturally. The sea and sky are what you watch from an airplane window, and the Longines HydroConquest GMT L3.790.4.96.6 brings both onto your wrist. A sunray blue dial sits under sapphire, framed by a ceramic bezel and carried on a polished-and-brushed steel bracelet.

Underneath is Longines’ exclusive L844 automatic, made for people who keep two times in their head. The 24-hour hand can be set to home while the main hands follow local time, and the date stays in step. With a silicon balance spring, the caliber resists magnetic fields and holds its accuracy, and it stores about 72 hours of power. In short, it is a capable travel watch that is also a real 300-meter diver.

Blue is the most expressive dial in this lineup without being loud. Indoors it reads as a deep navy, but in sunlight the sunray finish turns it bright. The 41mm diameter and 12.9mm height make it a sensible fit for most wrists.

Longines HydroConquest GMT Blue Steel, reference L3.790.4.96.6

• Stainless steel case, 41mm diameter, 12.9mm thick
• Ceramic insert on a unidirectional bezel
• Sunray blue dial with luminous hands and applied indexes
• L844 automatic GMT caliber, silicon balance spring, 72-hour reserve
• Date and 24-hour second-time-zone display
• 300-meter water resistance with screw-down crown and back
• Stainless steel bracelet, folding clasp, 21mm lug width

A dual-time diver that looks as good at the gate as it does at the shoreline.