Garmin G300 Pilot's Manual page 78

Flight instruments
Extended Course Line
Omni-bearing Selector (OBS) Mode (Single Display)
Enabling/disabling OBS Mode while navigating a GPS flight
plan:
1) From the PFD Page (one display) or PFD (two display), press the MENU
Key while navigating a flight plan or Direct-to.
2) With 'Set OBS and Hold' highlighted, press the ENT Key. The OBS
Mode Box is highlighted. In OBS Mode the subdued CRS Softkey
becomes the OBS Softkey.
3) Turn the FMS Joystick to select the desired course to/from the
waypoint.
4) To cancel OBS Mode and return to automatic waypoint sequencing,
press the MENU Key, with 'Release Hold' highlighted, press the ENT
Key. The OBS Softkey returns to the subdued CRS Softkey.
PFD or PFD Page Menu
(Set OBS Mode)
60
OBS Mode Annunciation
Garmin G300 Pilot's Guide
OBS Mode Box
PFD or PFD Page Menu
(Release OBS Mode)
190-00921-00 Rev. D
OBS Softkey