Garmin G300 Pilot's Manual page 83

Waypoint—Enter any waypoint along the currently active route as the
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reference waypoint. The reference waypoint defines the target location.
Profile—Enter the descent rate.
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Altitude—Enter the desired reference waypoint altitude. Select 'Above
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Waypoint' to use field elevation for airports in the Jeppesen database or
'MSL' to specify an exact MSL altitude target.
By—Enter the target location with settings of distance 'Before' or 'After'
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a reference waypoint. To set a target location at a reference waypoint,
enter a distance of zero.
VNAV Messages—Select 'On' or 'Off' to enable/disable VNAV alert
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messages.
Enabling/disabling the VNAV indicator:
1) From the PFD (dual display) or PFD Page (single display), press the
MENU Key.
2) With the 'Set Up PFD' menu option highlighted, press the ENT Key.
Skip to step 3 if at least one external navigator is configured.
3) Move the FMS Joystick to highlight the VNAV Indicator field.
4) Turn the FMS Joystick to highlight 'On' or 'Off'.
Capturing/cancelling VNAV profile:
1) Enter a valid VNAV profile and begin navigation.
2) From the PFD Page (one display) or PFD (two display), press the MENU
Key.
3) Turn or move the FMS Joystick to highlight 'Capture VNAV Profile' or
'Cancel Capture', and press the ENT Key. Selecting 'Capture VNAV
Profile' centers the VNAV indicator (must be navigating a Flight Plan or
Direct-to).
If the VNAV Profile is canceled, the VNAV Indicator, Vertical Deviation Scale and
the Required Vertical Speed Indicator (RVSI) are removed from the PFD.
190-00921-00 Rev. D Garmin G300 Pilot's Guide
Flight instruments
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