Select > Settings > Position Settings.

Constellations

Sets the GNSS system to use for position data.

Antenna Choice

Sets whether to use the device's internal GNSS antenna or a connected GNSS antenna.

See the Installation Instructions at garmin.com/manuals/SignalVHF for more information on using an external antenna.

Update Rate

Sets how often to obtain a position fix.

SBAS

Enables the use of satellite-based augmentation systems (SBAS) to enhance your position accuracy.