Garmin 420 Guida Utente

GNS 430 Pilot’s Guide and Reference

13-1

SECTION 13:  MESSAGES, 

ABBREVIATIONS, AND NAV TERMS

13.1  MESSAGES

The GNS 430 uses a flashing ‘MSG’ annunciator at the 

bottom  of  the  screen  (directly  above  the  MSG  Key)  to 
alert the pilot of any important information or warnings.  
While  most  messages  are  advisory  in  nature,  warning 
messages may require pilot intervention. 

When the ‘MSG’ annunciator flashes, press the MSG 

Key to display the message.  Press the MSG Key again to 
return to the previous page. 

The following is a list of available messages and their 

meanings:

  Airspace ahead -- less than 10 minutes - The 

GPS-calculated course is projected to enter a 
special use airspace within 10 minutes.  This 
message is automatically disabled within 30 nm of 
an arrival airport, when an approach is loaded.

  Airspace near and ahead - The GPS-calculated 

position is within 2 nm of the boundary of a 
special use airspace and the course is projected 
to enter the airspace within 10 minutes.  This 
message is automatically disabled within 30 nm of 
an arrival airport, when an approach is loaded.

  All data referenced to True North - The GNS 

430 has not detected a NavData card in the left 
data card slot.

  Altitude input failure - The GNS 430 is 

configured to receive altitude serializer data 
(Icarus, Rosetta, or Shadin) and it is not being 
received.  Or, the data was being received, but has 
been interrupted.  If a grey code altitude input 
is available, it is used instead.  If the problem 
persists, contact a Garmin dealer and check the 
installation and installation settings.  When this 
message occurs, no pilot action is required if 
enough satellites are available for a 3D position 
fix (provided no RAIM warnings are present).  
However, if only a 2D position fix is possible, the 
pilot should maintain the GPS altitude within 
1,000 feet of pressure altitude by entering the 
altitude on the Position Page.

  Approach is not active - The approach could 

not transition to ‘active’, at 2 nm or closer to 
the FAF.  Verify that ‘SUSP’ DOES NOT appear 
directly above the OBS Key, indicating the auto 
waypoint sequencing is suspended.  This message 
also appears if Receiver Autonomous Integrity 
Monitoring (RAIM) has determined that sufficient 
GPS satellite coverage DOES NOT exist for the 
current phase of flight (along with a ‘RAIM not 
available from FAF to MAP’ message).

  Approaching target altitude - The current GPS-

computed altitude is within 500 feet of the final 
Vertical Navigation target altitude.

  Approaching VNAV profile - The aircraft is 

within one minute of reaching the initial Vertical 
Navigation descent, or climb, point.

  Arrival at waypoint [waypoint name] - The 

aircraft is within the arrival alarm circle for the 
indicated waypoint.  The size of the arrival alarm 
circle is defined from the ‘CDI/Alarms’ menu 
option on the Setup 1 Page.