Garmin GPS III Owner's Manual

Also see for GPS III: Declaration of conformity Quick guide Owner's manual Owner's manual

The GPS III Pilot features two different navigation pages: HSI (horizontal situationindicator) and Highway. The HSI Page is first. The HSI Page provides graphic steeringguidance to a destination waypoint and will likely become your primary navigationscreen. (The Highway page also provides graphic steering guidance by displaying athree-dimensional perspective of your course and the surrounding area.) The HSIgraphically depicts a mechanical HSI, showing the desired course using a ‘D-bar’(course deviation bar; which is part of the course deviation indicator, or ‘CDI’) andcourse pointer. If you move off course, the D-bar will indicate off course distance anddirection. To return to the desired course, simply steer in the direction of the D-baruntil it returns to the center of the CDI. The CDI scale is adjustable, with the currentscale indicated at the bottom of the page. The scale setting represents the distance fromthe center of the CDI to full left or right limits.The HSI depicts your (ground) track heading using a rotating ‘compass card’.Don’t confuse this with the aircraft heading indicated on your panel. On a windy daythese two figures can differ significantly!The HSI page also provides a TO/FROM indication and vertical guidance, whenusing the unit’s vertical navigation (VNAV) features. Four user-selectable data fieldsindicate current speed, distance to destination, time en route and time of day.If you move off course, steerin the direction of the D-baruntil it returns to the center ofthe CDI.The ‘Big Numbers’ option(available from the HSI PageOptions) shows a smallercompass-type display andlarger data field characters.See page 42. 11GETTING STARTEDHSI PageHSI PageCompass Card(Track)Current Speedand Distance toWaypointTime to WaypointPointer(Desired Course)D-bar(part of CDI)