Using AXIS Flight Displays With an External GPS Navigator
If a 116C/NC fails and navigation reverts to a 116B, do not use the approach information provided by the internal navigation of the GDU™ 116B (VFR only) as a means of navigating any instrument approach. The consumer GPS provided in the GDU 116B AXIS™ flight display does not provide IFR qualified GPS data and is not suitable for IMC flight. These waypoints and associated course lines are made available for monitoring purposes only.
IFR external navigation may only be used if the CDI Source on the PFD is synced to the external navigation source.
No approach vertical guidance will be provided for published instrument procedures when loaded into the GDU 116B AXIS flight display.
If unsure whether or not your system uses an RS 232 connection for external GPS navigators contact your dealer or Garmin Product Support for clarification.
The GDU 116B internal GPS flight plan is for VFR use only.
In a configuration which includes one or more external GPS navigators (i.e., GTN or GNS Series), the AXIS flight display presents the selected external GPS Navigator’s flight plan and guidance information on the PFW and MFW. When a serial GPS/NAV/COM LRU is connected to the AXIS the CDI Selection Button will display the available functions for that CDI. Example: if the external nav unit is capable of providing GPS and VOR/LOC navigation, the button will indicate "GPS VOR" or "GPS LOC". The button will have the currently selected navigation source displayed by highlighting it by the appropriate navigation color; satellite based navigation is displayed in magenta and radio based navigation in green. The CDI source that is not currently selected will be displayed in white. The radio navigation indication of VOR or LOC changes based on the tuned frequency in the navigator.
When an external navigator is configured the internal GPS can still be used for VFR navigation unless one of the following HSDB navigation LRU's are installed:
- GPS 175
- GNX 375
- GTN 625Xi
- GTN 725Xi
- GNC 355
- GDU 116C
- GTN 635Xi