Garmin GNS 530 Manual page 17

DA 40 AFM
15. The vertical navigation key allows you to create a three-dimensional profile which
guides you to a final (target) altitude at a specified location.
16. The flight plan key allows you to create, edit, activate and invert flight plans, as
well as access approaches, departures and arrivals. A closest point to flight plan
feature is also available from the flight plan key.
17. The message key is used to view system messages and to alert you to important
warnings and requirements.
18. The OBS key is used to select manual or automatic sequencing of waypoints.
Pressing this key selects OBS mode, which will retain the current 'active to'
waypoint as your navigation reference even after passing the waypoint (i.e.,
prevents sequencing to the next waypoint). Pressing the OBS key again will return
to normal operation, with automatic sequencing of waypoints. Whenever OBS
mode is selected, you may set the desired course to/from a waypoint using the
OBS Page, or an external OBS selector on your HSI.
19. The CDI key is used to toggle which navigation source (GPS or VLOC) provides
output to the HSI.
Doc. # 6.01.01-E Rev. 0 01 Dec 2001
Supplement A21
GNS 530
Page 9 - A21 - 16