Horizontal Situation Indicator (Hsi): Aircraft Heading - Garmin G500H Cockpit Reference Manual

The Trim Ball Indicator is the bar beneath the roll pointer. The indicator moves
with the roll pointer and moves laterally away from the pointer to indicate lateral
acceleration. Trim is indicated by the location of the bar relative to the pointer.
One bar displacement as shown below is equivalent to one ball displacement on
a traditional Trim Ball Indicator.
Roll Scale Zero

Horizontal Situation Indicator (HSI): Aircraft Heading

The top of the HSI displays current heading, current GPS track (magenta
diamond), heading trend, and turn rate markings. The heading trend indicates
what the aircraft heading will be in six seconds if the heading rate remains
unchanged. The turn rate markings, along with the heading trend, display standard
and half-standard rate turns.
Current GPS Track
NOTE: If magnetic heading is lost, GPS ground track will be displayed
in place of heading. If magnetic heading and GPS ground track are
lost, a red "X" will appear in place of heading.
190-01150-03 Rev B
PRIMARY FLIGHT DISPLAY (PFD)
Roll Pointer
Trim Indication
Current Heading Turn Rate Markings
HSI Heading Markings
G500H Cockpit Reference Guide
Trim Ball Indicator
Heading Trend
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