A mission mode is a recipe applied once over the systems you already have. Your own adjustments afterwards survive, and the recipe can never touch propulsion, never switch the bilge pump off and never mutes an alarm.
The mode row sits in the Helm’s top bar and at the top of the phone’s Home tab: six glove-sized chips. Entering a mode shows a quiet three-second toast directly below the alarm banner, so it can never paint over it.
A mode is a declarative recipe applied over the systems you already have: circuits pre-armed on the switching page, the alarm threshold profile swapped, the display set. It is applied once on entry and never re-applied, so anything you change afterwards stays changed. The active mode survives a reload and is published on the boat’s data bus, so the phone and the Helm always agree.
From the phone away from the boat only Away and Anchor can be entered; the rest answer “Be aboard to enter this mode”.
Night is a layer over Fish or Cruise, not a mode of its own: the helm goes red-shifted on near-black and the shell dims, and the fishing or underway setup underneath stays as it was.
The demo runs the real Helm on a simulated day — tap a chip and watch the boat change setup.