Adding a date to a pilot's watch sounds like a small change, but it is the one most owners end up using every day. The Marathon NAV-D (reference WW194013BK-0101-KIT) is the 41mm Pilot's Navigator with Date in Standard-Issue form: black dial, tritium lume and Swiss quartz in a lightweight composite case.

Standard-Issue means the dial carries no government markings, just the Marathon name. The date sits at 4:30, tucked between the indices so it never crowds the hour markers at 3 or 6. Everything else follows the Navigator recipe Marathon worked out with Kelly Air Force Base in 1986: a featherweight composite shell, a sapphire crystal, a bi-directional 12-hour bezel for following a second time zone, and tritium gas tubes on the markers, hands and pip that glow continuously for years.

The Swiss ETA F06.115 HeavyDrive quartz movement provides high-torque hands and low maintenance, and the case has an easy-access battery hatch for straightforward battery service. At 11mm thick and 6 ATM water resistant, the NAV-D slips under a cuff, stands up to rain and handwashing, and wears comfortably all day on its black nylon strap.

Marathon NAV-D WW194013BK-0101-KIT Specifications

• Reference: WW194013BK-0101-KIT
• Case: black composite shell, 41mm, 11mm thick
• Movement: ETA F06.115 HeavyDrive Swiss quartz
• Date: at 4:30
• Water resistance: 6 ATM, pressure crown
• Crystal: sapphire
• Lume: tritium gas tubes
• Bezel: bi-directional 12-hour
• Dial and strap: Standard-Issue black dial; black nylon strap, 20mm lugs

The classic Navigator, with the one complication you will reach for daily.