Garmin G5 Pilot's Manual page 72

AFCS
3.3.4.3 TRACK MODE (TRK)
Track Mode is activated by pressing the TRK Key on the GMC 507. Track Mode
acquires and maintains the Selected Ground Track. The Selected Ground Track is
displayed as a magenta bug on the HSI and in the box on the bottom right of the HSI.
Changing the selected ground track:
1) Press the Selection Knob to display the Menu.
2) Select Track and use the Selection Knob to change the Selected Ground
Track.
Or
Rotate the HDG/TRK Knob.
Activating track mode:
Press the TRK Key on the GMC 507.
Turns are commanded in the same direction as Selected Ground Track Bug movement,
even if the bug is turned more than 180˚ from the present heading (e.g., a 270˚ turn
to the right). However, Selected Ground Track changes of more than 330˚ at a time
result in turn reversals.
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G5 Electronic Flight Instrument Pilot's Guide for Certified Aircraft
Figure 3-19 Track Mode Annunciation
190-01112-12 Rev. F