Garmin Flight Deck 100 User Manual

190-00728-04  Rev. A

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A Low Altitude Annunciation is available only when SBAS is available.  In addition, TAWS must be 

inhibited in order for this annunciation to be shown.

When the Final Approach Fix (FAF) is the active waypoint in a RNAV GPS approach using vertical guidance,

a Low Altitude Annunciation may appear if the current aircraft altitude is at least 164 feet below the prescribed
altitude at the FAF. A black-on-yellow LOW ALT annunciation appears to the top left of the altimeter, flashing
for several seconds then remaining displayed until the condition is resolved.

For altitude awareness, a Minimum Descent Altitude (MDA) or Decision Height (DH), based on barometric

altitude or optional radar altimeter height.  When active, the altitude setting is displayed to the lower left of the 
altimeter and with a bug at the corresponding altitude along the altimeter (once the altitude is within the visible 
range of the tape). The following visual annunciations alert the pilot when approaching MDA or DH:

• When the aircraft altitude descends to within 2500 feet of the MDA/DH setting, the BARO MIN or RA MIN

box appears with the altitude in light blue text.  The bug appears on the altitude tape in light blue once in 
range.

• When the aircraft passes through 100 feet of the MDA/DH, the bug and text turn white.

• Once the aircraft reaches MDA/DH, the bug and text turn yellow and the aural alert, “Minimums. Minimums”,

is generated.