Fourth Hand - GMT Watch Setter

Set your GMT watch accurately

Only for iPhone

$2.99 · Designed for iPhone. Not verified for macOS.

iPhone

Pick your zones. The app counts the crown clicks and the bezel clicks for you, then walks you through them against a dial that moves as you go. A GMT watch shows three time zones at once. Setting one means putting four hands in the right places in the right order, and most manuals assume you already know how. Pick your zones. The app counts the crown clicks and the bezel clicks for your offsets, then walks you through them a step at a time, against a diagram of your own dial that moves as you work. WHAT YOU GET Hand positions for your zones, to the minute. A crown click count, and a bezel click count with the direction to turn. The clicks it takes to walk the date round on a movement with no quickset. A reading table for the finished watch. THREE MECHANISMS A true GMT, with a fourth 24-hour hand over a 24-click bezel. Three zones. A dive watch with no fourth hand, so the second zone lives on the 120-click bezel. Two zones. A three-hander under a 24-hour ring. The ring counts a whole day and the hour hand laps twice a day, so the scale runs at double speed. One click is half an hour, and a full turn of the bezel buys twelve hours. A half-hour offset lands on a detent, which a true GMT cannot manage. IN THE APP A spoken guide, for when both hands are on the watch. A bezel that turns under your finger, with a detent you can feel and hear. Fifteen dials. No account and no network. The app collects nothing.

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The developer, Marionette Consulting LLP, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Information

    Seller
    Marionette Consulting LLP
    Size
    13.6 MB
    Category
    Lifestyle
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Marionette Consulting LLP
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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