VMG Mode

In VMG Mode the SC-1 shows your Velocity Made Good based on a wind direction you have defined. The display is updated at 1Hz(every second), 2Hz(twice a second) or 4Hz(4 times a second) depending on device settings.

The following diagram shows the SC-1 with both the upper and lower displays in VMG mode.

The SC-1 calculates your VMG upwind and downwind using the method illustrated below:

Whether you are sailing upwind or downwind, the SC-1 breaks your boat's velocity into two perpendicular components. One component is perpendicular to the wind direction. This component is effectively wasted as it is not helping you make any progress upwind or downwind. The other component is parallel to the wind direction. This is your VMG.