Garmin G1000 Manual page 84

FLIGHT INSTRUMENTS
Changing navigation sources:
1) Press the CDI Softkey to change from GPS to VOR1 or LOC1. This places the cyan tuning box over the NAV1
standby frequency in the upper left corner of the PFD.
2) Press the CDI Softkey again to change from VOR1 or LOC1 to VOR2 or LOC2. This places the cyan tuning box
over the NAV2 standby frequency.
3) Press the CDI Softkey a third time to return to GPS.
Pressing the CDI
Softkey Cycles through
Navigation Sources
The system automatically switches from GPS to LOC navigation source and changes the CDI scaling
accordingly when all of the following occur:
• A localizer or ILS approach has been loaded into the active flight plan
• The final approach fix (FAF) is the active leg, the FAF is less than 15 nm away, and the aircraft is moving
toward the FAF
• A valid localizer frequency has been tuned
• The GPS CDI deviation is less than 1.2 times full-scale deflection
GPS steering guidance is still provided after the CDI automatically switches to LOC until LOC capture, up
to the Final Approach Fix (FAF) for an ILS approach, or until GPS information becomes invalid. Activating
a Vector-to-Final (VTF) also causes the CDI to switch to LOC navigation source. GPS steering guidance is not
provided after this switch.
On some ILS approaches where the glideslope intercept point is at or in close proximity to the fix prior to
the FAF (see Figure 2-26), it is possible to be above the glideslope when the navigation source automatically
switches from GPS to LOC. The probability of this occurring varies based on air temperature.
70
NAV1 Selected for Tuning
GPS
Selected
Figure 2-25 Selecting a Navigation Source
Garmin G1000 Pilot's Guide for the Socata TBM 850/900
NAV2 Selected for Tuning
VOR1
Selected
LOC2
Selected
190-00709-05 Rev. D