Garmin 530w Manual

							201
COM needs service — (GNS 530W only) The unit has 
detected a failure in its communications transceiver. The 
COM transceiver may still be usable, but the unit should 
be returned (at your earliest convenience) to your Garmin 
dealer for service. 
COM push-to-talk key stuck — (GNS 530W only) The 
external push-to-talk (PTT) switch is stuck in the enabled 
(or “pressed”) state. Try pressing the PTT switch again to 
cycle its operation. If the message persists, contact your 
Garmin dealer for assistance. 
COM remote transfer key is stuck — (GNS 530W only) 
The remote COM transfer switch is stuck in the enabled 
(or “pressed”) state. Try pressing the switch again to cycle 
its operation. If the message persists, contact your Garmin 
dealer for assistance. 
COM transfer key stuck — (GNS 530W only) The 
COM flip-flop key is stuck in the enabled (or “pressed”) 
state. Try pressing the COM flip-flop key again to cycle 
its operation. If the message persists, contact your Garmin 
dealer for assistance. 
COM transmitter power has been reduced — (GNS 
530W only) The unit has detected excessive unit tempera
-
ture and/or an insufficient voltage level. The COM trans-
ceiver transmit power has been automatically reduced to 
compensate for the condition. For excessive temperatures, 
check for adequate ventilation or check cooling air flow. 
If the message persists, contact your Garmin dealer for 
assistance. 
Configuration error - Config service req’d —  The con
-
figuration information provided by the installer has been 
lost or corrupted. Contact your Garmin dealer for service. 
Data transfer cancelled (crossfill is busy) — An 
attempt to transfer flight plan data during a unit-to-unit 
crossfill was cancelled. The host unit is busy. Wait until any 
previous crossfill operation is complete, before re-attempt
-
ing the transfer. 
Data transfer cancelled (data invalid) — An attempt to 
transfer a single user waypoint during a unit-to-unit crossfill 
was cancelled. No waypoint was specified on the Crossfill 
Page. Select a user waypoint and re-attempt the transfer. 
Data transfer cancelled (version mismatch) — An attempt 
to transfer data during a unit-to-unit crossfill was cancelled. 
The database versions of the two 500W-series unit are not 
identical. If necessary, update the database(s) so they match. 
Contact Jeppesen or your Garmin dealer for assistance. 
Data transfer error, please re-transmit — An error was 
detected during unit-to-unit crossfill of user data (user 
waypoints and/or flight plans). The data transfer should be 
re-attempted. 
Data transfer is complete — The unit-to-unit crossfill of 
all user waypoint data has finished. 
Database changed, validate user modified procedures 
— You have modified one or more approaches, departures or 
arrivals from their original published form. When the Nav
-
Data® card is replaced (database update), you must manually 
verify your changes in the new database. This message occurs 
each time a flight plan containing a modified procedure 
(generated from a prior database version) is activated. To 
eliminate the message, re-create the flight plan from the new 
database, then make the desired modifications. 
Display backlight failure — The 500W-series unit has 
detected a failure in the display backlighting. The unit 
should be taken to your Garmin dealer for service. 
Do not use for navigation — The 500W-series unit is in 
Demo Mode and must not be used for actual navigation. 
FPL has been truncated — The flight plan (FPL) was 
truncated because not enough room existed to insert an 
approach, departure or arrival. This may occur upon power 
up when a database change increases the number of way
-
points within an instrument procedure. 
FPL is full —  remove unnecessary waypoints — An 
attempt has been made to add more than 100 waypoints 
to a flight plan (FPL). The 500W-series unit does not allow 
more than 100 waypoints per flight plan. 
12 - MESSAGES
ABBREVIATIONS &  NAV TERMS 
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							202
FPL waypoint is locked — At least one flight plan (FPL) 
waypoint is locked because the waypoint has been removed 
from the current NavData
® card (database change), the data 
card is missing, or the data card has failed. 
FPL waypoint moved — The position data for one or 
more flight plan (FPL) waypoints moved at least 0.33 arc 
minutes in the current NavData
® card (database change). 
G/S has failed — (GNS 530W only) The unit has detected 
a failure in its glideslope receiver. The glideslope receiver 
is not available and the unit should be returned to your 
Garmin dealer for service. 
G/S is not responding — (GNS 530W only) Internal 
system-to-system communication between the main proces
-
sor and the glideslope receiver has failed. Operational status 
of the glideslope receiver is unknown and the unit should 
be returned to your Garmin dealer for service. 
G/S needs service — (GNS 530W only) The unit has 
detected a failure in its glideslope receiver. The glideslope 
receiver may still be usable, but the unit should be returned (at 
your earliest convenience) to your Garmin dealer for service. 
GAD configuration required — The GAD 42 Interface 
Adapter has lost the configuration information stored in its 
internal memory. Any mechanical indicators connected to 
your 500W-series unit are unusable and the GAD 42 should 
be returned to your Garmin dealer for service. 
GAD needs service — The 500W-series unit has detected a 
failure in the GAD 42 interface adapter. Any mechanical indi
-
cators connected to your unit are unusable and the GAD 42 
should be returned to your Garmin dealer for service. 
GDL 69 is not responding — No data is being received 
from the GDL 69. If the problem persists, contact your 
Garmin dealer for service. 
GDL 88 is unable to transmit ADS-B messages — 
The GDL 88 is reporting that it has a problem transmit
-
ting ADS-B messages. The unit may not be trasmitting 
ADS-B information correctly and the traffic picture may be 
degraded. 
GDL 88 Service Required — The GDL 88 is reporting that 
it has a problem with receiving ADS-B data. The unit may 
continue to function, but the traffic picture may be degraded. 
GDL 88 Traffic Failure — The GDL 88 is reporting that 
is has a problem processing all traffic information. The traf
-
fic function of the GDL 88 is unavailable. 
GDL 88 ADS-B traffic has failed or GDL 88 Traffic 
Failure — The GDL 88 is reporting that it has a problem 
processing ADS-B traffic data. The ADS-B traffic picture 
may be degraded. 
GDL 88 Traffic Alerting not available or GDL 88 CSA 
Failure — The GDL 88 is reporting that the CSA application 
has failed. Traffic alerting on ADS-B traffic is unavailable. 
GDL 88 Connection has been lost — The GNS unit 
cannot communicatie with the datalink. Data from the data
-
link will not be available. 
GDL 88 ADS-B transmit has failed — The GDL 88 is 
unable to transmit. If the problem persists, contact your 
Garmin dealer for service. 
GDL 88 ADS-B is not transmitting position — The 
GDL 88 is not transmitting. If the problem persists, contact 
your Garmin dealer for service. 
GDL 88 ADS-B fault - Check GDL 88 Status Page — A 
fault has been detected. Check the GDL 88 Status page in 
Aux mode. 
GPS is not responding - Check GPS antenna — Inter
-
nal system-to-system communication between the main 
processor and the GPS receiver has failed. Operational 
status of the GPS receiver is unknown and the unit should 
be returned to your Garmin dealer for service after first 
checking antenna connections or for a short in the antenna. 
GPS needs service — The 500W-series unit has detected 
a failure in its GPS receiver. The GPS receiver may still be 
usable, but the unit should be returned (at your earliest 
convenience) to your Garmin dealer for service. 
GTN transfer canceled version mismatch — The GNS 
and GTN units are using different Navigation Database cycles. 
12 - MESSAGES
ABBREVIATIONS &  NAV TERMS 
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GTN flight plan not supported — The GTN active flight 
plan contains a waypoint that is not recognized by the 
GNS, e.g.  GTN has a European waypoint and the GNS 
Navigation Database is North America only. 
Inside airspace — Your GPS-calculated position lies 
within the boundaries of a special use airspace. This mes
-
sage is automatically disabled within 30 NM of an arrival 
airport, when an approach is loaded. 
Insufficient Terrain Database Resolution – The 
installed terrain database does not have sufficient resolution 
to support HTAWS. 
Invalid closest pt of FPL — A closest point cannot be 
created from the waypoint entered on the “Closest point of 
flight plan” window. This occurs when the selected way
-
point is beyond the limits of all legs in the flight plan, too 
far away, or when a unique waypoint name for the closest 
point cannot be created. 
Invalid FPL modification — An attempt was made to 
modify the final course segment (FAF to MAP) of an instru
-
ment approach. The 500W-series unit does not allow the 
modifications. 
Invalid waypoint ident — An attempt was made to 
create a user waypoint with an invalid name. The 500W-
series unit does not allow spaces between characters in the 
waypoint name. 
Large magnetic variance — Verify all course angles 
—  A valid value of magnetic variation is not available for 
this location. Check all course angles manually. 
Loss of GPS Navigation - Use other N AV if available 
—  The Dead Reckoning annunciator appears on the left 
side of the map display when GPS position is unavailable 
and the unit is in Dead Reckoning mode. Dead Reckoning 
mode will continue until GPS position is restored. 
Loss of integrity — cross-check NAV — The GPS posi
-
tion does not meet necessary criteria. Use other navigation 
devices to verify your position and navigation. 
Low Battery - Unit Needs Service —  
Time data may 
have been lost due to a memory battery failure
MAIN processor requires service — The 500W-series 
unit has detected a failure in the main system processor. 
The 500W-series unit is not usable and should be taken to 
your Garmin dealer for service. 
Near airspace — less than 2 nm — Your GPS-calculated 
position is within 2 NM of a special use airspace boundary, 
but you are not projected to enter the airspace. This mes
-
sage is automatically disabled within 30 NM of an arrival 
airport, when an approach is loaded. 
No altitude input is being received — No altitude data 
is being received from RS-232 (Serializer: Icarus, Rosetta or 
Shadin) or grey code inputs. If the problem persists, contact 
your Garmin dealer and check the installation and installa
-
tion settings. 
No basemap data available — The 500W-series unit 
has detected a failure in the built-in basemap (land data) 
memory. Land data does not appear on the Map Page. 
Other unit functions continue to work normally, however 
the 500W-series unit should be taken to your Garmin 
dealer for service at your earliest convenience. 
NON WGS84 WPT — Do not use GPS for nav to 
[xxxxx]. The position of the selected waypoint [xxxxx] is 
not calculated based on the WGS84 map reference datum 
and may be positioned in error as displayed. Do not use 
GPS to navigate to the selected non-WGS84 waypoint. 
Non-WGS84 wpt navigation [xxxxx]. — The position 
of the selected waypoint [xxxxx] is not calculated based on 
the WGS84 map reference datum and may be positioned 
in error as displayed. Do not use GPS to navigate to the 
selected non-WGS84 waypoint. 
Not receiving input data on 429 Channel #1 or #2 — No 
data has been received on the ARINC 429 channel connection 
for a period exceeding five seconds. If the problem persists, 
the installation should be checked by your Garmin dealer. 
Not receiving input data on 232 Channel #(1 through 
5) — No data has been received on one (or more) of the 
RS-232 channel connections for a period exceeding ten 
seconds. If the problem persists, the installation should be 
checked by your Garmin dealer. 
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ABBREVIATIONS &  NAV TERMS 
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Not receiving traffic data — No traffic data is being 
received. 
If the problem persists, the installation should be 
checked by your Garmin dealer. 
NRST key stuck – The NRST key is stuck in the enabled 
(or “pressed”) state. Try pressing the NRST key again to 
cycle its operation. If the message persists, contact your 
Garmin dealer for assistance. 
OBS key stuck — The OBS key is stuck in the enabled 
(or pressed) state. Try pressing the OBS key again to cycle 
its operation. Check for proper operation of both the inter
-
nal and remote keys (if present). If the message persists, 
contact your Garmin dealer for assistance. 
OBS not available — The OBS mode could not be 
activated, because 1) no destination waypoint has been 
selected, or 2) the GPS receiver cannot currently determine 
its position. 
Obstacle database integrity error — The 500W-series 
unit has detected a problem with a database on the TAWS/
Terrain data card. The data is not usable and the card 
should be returned to your Garmin dealer for service. 
Position outside terrain database coverage region 
–This is supplemental information to explain why “TER 
N/A” is being annunciated. 
RAIM position warning — Although sufficient GPS 
satellite coverage may exist, Receiver Autonomous Integrity 
Monitoring (RAIM) has determined the information from 
one or more GPS satellites may be in error. The resulting 
GPS position may be in error beyond the limits allowed 
for your current phase of flight. Cross-check your position 
with an alternate navigation source. If the warning occurs 
during a final approach segment (FAF to MAP), execute the 
published missed approach. 
Scheduler message [1-9]— [user entered text] — The 
user-entered scheduler message time has expired, and the 
scheduler message is displayed. 
Searching the sky — The 500W-series unit is searching the 
sky for GPS satellites. 
Select appropriate frequency for approach — You are 
inbound and within 3 NM of the FAF; and the active VLOC 
frequency does not match the published frequency for the 
approach. Tune the standby VLOC frequency to the proper 
frequency and press the VLOC flip-flop key to “activate” 
the frequency. 
Select VLOC on CDI for approach — (GNS 530W only) 
You are inbound and within 3 NM of the FAF; and the 
active approach is not a GPS-approved approach. Verify 
that the VLOC receiver is tuned to the proper frequency 
and press the CDI key to display “VLOC” (directly above 
the CDI key). 
Set course to [###]° — The course select for the external 
CDI (or HSI) should be set to the specified course. The 
message only occurs when the current selected course differs 
from the desired track by 10°, or greater. 
Steep turn ahead — This message appears approximately 
one minute prior to a turn in one of the following three 
conditions: 1) the turn requires a bank angle in excess of 
25° in order to stay on course, 2) the turn requires a course 
change greater than 175°, or 3) during a DME arc approach 
the turn anticipation distance exceeds 90 seconds. 
Stored data was lost — All user waypoints, flight plans 
and system settings have been lost due to a system reset. 
Stormscope device has failed — The 500W-series unit 
cannot communicate with the WX-500 and/or the WX-500 
is reporting a system failure. 
Stormscope heading has failed — The WX 500 is 
reporting invalid heading data. The failure may be within 
the WX 500 or other connected equipment. 
TAWS has failed — The 500W-series unit has detected a 
failure in its TAWS system. The most likely cause is a miss
-
ing or corrupt Terrain database. If the Terrain database is 
not the cause, the unit should be returned to your Garmin 
dealer for service. 
TAWS inhibit key stuck — The external TAWS inhibit 
key is stuck. 
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ABBREVIATIONS &  NAV TERMS 
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TAWS mute caution key is stuck — The external 
HTAWS aural suppression input is stuck.
TAWS reduced protection key is stuck — The external 
TAWS reduced protection key is stuck. 
TCAD altitude data invalid — If the Ryan TCAD has 
an altitude failure, the TCAD will announce an altitude 
failure aurally (“TCAD ALTITUDE DATA INVALID”) but 
continue operating.  The relative altitude for the targets will 
be invalid. 
TCAD device needs service — The GDL 88 is reporting 
that the external traffic system has a low battery. 
TERRAIN configuration conflict —  The current TAWS/
Terrain configuration is not supported by the hardware. 
The TAWS hardware may have failed, or the unit may 
be misconfigured. The unit’s terrain capabilities will be 
downgraded to “Terrain” instead of “TAWS”. Contact your 
Garmin dealer for service. 
TERRAIN configuration has changed —  The unit’s ter-
rain/TAWS settings have changed since it was last turned on 
in normal mode. Contact your Garmin dealer for service. 
Terrain database integrity error — The 500W-series unit 
has detected a problem with a database on the TAWS/Ter
-
rain data card. The data is not usable and the card should 
be returned to your Garmin dealer for service. 
TERRAIN has failed —  The unit has detected a failure 
in the terrain system. The most likely cause is a missing 
or corrupt Terrain database. Terrain functionality is not 
available. If the Terrain database is not the cause, the unit 
should be returned to your Garmin dealer for service. 
Timer has expired — The count down timer has reached 
zero. 
Traffic device has failed — The 500W-series unit cannot 
communicate with the SKY497 or TCAD and/or the SKY497 
or TCAD is reporting a system failure. This can also be dis
-
played due to GDL 88 failure.  Traffic device needs service — the traffic device is report
-
ing a system failure. The unit may still be usable, but should 
be returned (at your earliest convenience) to your Garmin 
dealer for service. 
True north approach - Change Mag Var HDG to true 
— The selected approach requires navigation information 
be referenced to true north. In the AUX function, change 
Heading Mode to “true.” 
User card format unknown — A data card has been 
inserted, but the format of the card is not recognized. 
User Magnetic Variation is active – Note that “User” is 
selected on the AUX -- Units/Mag Var page and the mag
-
netic variation value provided on that page is being used. 
VLOC has failed — The GNS 530W has detected a failure 
in its VLOC receiver. The VLOC receiver is not available 
and the unit should be returned to your Garmin dealer for 
service. 
VLOC is not responding — (GNS 530W only) Internal 
system-to-system communication between the main proces
-
sor and the VLOC receiver has failed. Operational status 
of the VLOC receiver is unknown and the unit should be 
returned to your Garmin dealer for service. 
VLOC needs service — (GNS 530W only) The unit has 
detected a failure in its VLOC receiver. The VLOC receiver 
may still be usable, but the unit should be returned (at your 
earliest convenience) to your Garmin dealer for service. 
VLOC remote transfer key is stuck — (GNS 530W 
only) The remote VLOC transfer switch is stuck in the 
enabled (or “pressed”) state. Try pressing the switch again 
to cycle its operation. If the message persists, contact your 
Garmin dealer for assistance. 
VLOC transfer key stuck — (GNS 530W only) The 
VLOC flip-flop key is stuck in the enabled (or “pressed”) 
state. Try pressing the VLOC flip-flop key again to cycle 
its operation. If the message persists, contact your Garmin 
dealer for assistance. 
12 - MESSAGES
ABBREVIATIONS &  NAV TERMS 
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Waypoint already exists — The name you have entered 
for a user waypoint already exists in memory. 
Waypoint(s) have been replaced — One or more user way-
points were updated during a unit-to-unit crossfill operation. 
Waypoint memory is full — You have used all 1000 user 
waypoint locations in the 500W-series unit memory. Delete 
unwanted waypoints to make room for new entries. 
Turn Advisory and Arrival Annunciations
The following annunciator messages may appear in the 
lower right corner of the 500W-series unit display: 
Arriving at waypoint — Arriving at the destination way
-
point for the active leg. 
Hold direct — “Direct” holding pattern entry. 
Hold parallel — “Parallel” holding pattern entry. 
Hold teardrop — “Teardrop” holding pattern entry. 
Left to xxx° in xx sec — Turn advisory. Turn to the indi
-
cated heading by the time shown. 
Left to xxx° now — Turn advisory. Turn to the indicated 
heading by the time shown. 
Next DTK xxx° in xx sec — Waypoint alert. Prepare to 
turn to the indicated heading upon waypoint passage. 
PTK end in xx sec — Parallel Offset is terminating. 
Right to xxx° in xx sec — Turn advisory. Turn to the indi
-
cated heading by the time shown. 
Right to xxx° now — Turn advisory. Turn to the indicated 
heading by the time shown. 
Flight Plan Transfer Messages
Flight plan imported successfully — The Flight Plan 
file contained Route Points (that is, it didn’t contain only 
User Waypoints) and there were no errors when import
-
ing them to the target position within the unit’s Flight Plan 
Catalog.  Waypoint import successful - No stored FPL data 
was modified —  The Flight Plan file contained one or 
more User Waypoints and there were no errors when adding 
them to the User Database. 
Flight plan import failed — The unit failed to load 
any information from the Flight Plan file. (Neither the Flight 
Plan Catalog nor the User Database was modified.) 
File contains waypoints only — The Flight Plan file 
did not contain any Route Points but one or more User 
Waypoints were imported successfully. 
FPL import message(s): — The Flight Plan file con
-
tained Route Points (it didn’t contain only Waypoints) and 
there were some errors or warnings (see below). Some or all 
information was imported successfully. FPL too long, truncated (appended to the import 
results text) — The Flight Plan file contained more Route 
Points than a flight plan can support. 
Invalid FPL wpt(s) locked (appended to the import 
results text) — The Flight Plan file contained one or more 
Waypoints that could not be found in the navigation data
-
base or imported into the User Database. 
User waypoint database full - Not all waypoints 
loaded (appended to the import results text) — One or 
more of the User Waypoints in the Flight Plan file were not 
created because the unit’s User Database is full (or became 
full during the import operation). 
User waypoint(s) renamed (appended to the import 
results text) — One or more of the User Waypoints in the 
Flight Plan file was renamed during the import operation. 
Verify FPL before use (appended to the import 
results text) — One or more of the User Waypoints or 
Route Points to be imported were modified in some way 
(one or more of messages [f] through [i] were displayed) and 
changes should be verified before using the flight plan for 
navigation. 
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ABBREVIATIONS &  NAV TERMS 
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Abbreviations
The following is a list of abbreviations and acronyms 
used on the 
500W-series unit and their meanings: 
ACTV —  Active
A LT  —  Altitude
APR —  Approach
APT —  Airport
ARSPC —  Airspace
ARTCC —   Air Route Traffic Control Center
ARVL —  Arrival
AUX —  Auxiliary
AVGAS —   Aviation-grade Gasoline
AVTN —  Aviation
BARO —   Barometric setting
BRG —   Bearing To
°C —   Degree Celsius
C/V —  COM/VLOC
CAS —   Calibrated Airspeed
CDI —   Course Deviation Indicator
CLR —  Clear
COM —   Communications Transceiver
CRSR —  Cursor
CTA —   ICAO Control Area
CTAF —   Common Traffic Advisory
 
  Frequency
CTR —   Center (see ARTCC) CUM —  Cumulative
DB —  Database
DEN —  Density
DEP —  Departure
DEPT —  
Departure guidance
DIS —  Distance
DME —   Distance Measuring Equipment
DP —   Departure Procedure
DTK —   Desired Track
EFF —  Efficiency
ELEV —  Elevation
ENDUR —  Endurance
ENR —   En Route
ENT —  Enter
EPU —   Estimated Position Uncertainty
ESA —   En Route Safe Altitude
ETA —   Estimated Time of Arrival
ETE —   Estimated Time En Route
°F —   Degrees Fahrenheit
FAF —   Final Approach Fix
FDE —   Fault Detection and 
 
  Exclusion
FF —   Fuel Flow
FIR —   Flight Information Region
FLTA—   Forward Looking Terrain Avoidance
FOB —   Fuel On Board
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FPL —  Flight Plan
fpm —   Feet Per Minute
FREQ —  Frequency
FSS —   Flight Service Station
ft —  Feet
G/S —  Glideslope
gl —   Gallons
GPS —   Global Positioning System
GS —   Ground Speed
HAL —   Horizontal Alarm Limit
HDG —  Heading
HFOM —   Horizontal Figure of Merit
hg —   Inches of Mercury
HPL —   Horizontal Protection Level
HWY —  Highway
IAF —   Intermediate Approach Fix
ID —  Identifier
ig —   Imperial Gallons
ILS —   Instrument Landing System
IND —  Indicated
INT —  Intersection
INTEG —  Integrity
ITI—  Imminent Terrain Impact
kg —   Kilograms kHz —  Kilohertz
km —  Kilometers
kph —  
Kilometers Per Hour
kt —   Knots
L/VNAV —   Lateral and vertical navigation 
 
    guidance, LNAV/VNAV service level
LAT/LON —  Latitude/Longitude
lb —   Pounds
LCL —  Local
LFOB —   Left-over Fuel On Board
LNAV —   Lateral Navigation only
LNAV+V —   Lateral Navigation with advisory 
 
  vertical guidance
LOC —  Localizer
LP —   Lateral Precision Performance
LPV —   Lateral Precision Performance with 
 
  Vertical Guidance
LP +V —   Lateral Precision Performance with 
 
    Advisory Vertical Guidance
LRES —   Left-over Fuel Reserve Time
Lrg —  Large
lt —  Liters
°M —   Degrees Magnetic
m, mt —   Meters
MAP —   Missed Approach Point
MAHP —   Missed Approach Hold Point
MAPR —   Missed approach guidance
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mb —  Millibars of Pressure
Med —  Medium
MGRS —   Military Grid Reference System. A 
 
  Position format
MHz —  Megahertz
mi —   Statute Miles
MOA —   Military Operations Area
mph —   Statute Miles Per Hour
mpm —   Meters Per Minute
mps —   Meters Per Second
MSA —   Minimum Safe Altitude
MSG —  Message
MSL —   Mean Sea Level
mul —  Multicom
NATNL —  National
NAV —  Navigation
NAVAID —   Navigational Aid
NDB —   Non-Directional Radio Beacon
NM —   Nautical Miles
NRST —  Nearest
NUM —  Number
OBS —   Omnibearing Selector
OCN —  Oceanic
PDA —   Premature Descent Alert
P.POS —   Present Position PROC —  Procedure(s)
PROV —  Province
PTK —  
Parallel Track
PWR —  Power
RAD —  Radial RAIM —   Receiver Autonomous Integrity Moni
-
toring
REF —  Reference
REQ —   Required / Requirements
RESTRICTD —   Restricted
RNG —  Range
RTC —   Required Terrain Clearance
RX —  Receive
SBAS —   Space-Based Augmentation System
SID —   Standard Instrument Departure
Sml —  Small
SPD —  Speed
SQ —  Squelch
SRFC —  Surface
STAR —   Standard Terminal Arrival Route
SUA —   Special Use Airspace
SUSP —   
Waypoint Sequencing Suspended
°T —   Degrees True
TACAN —   Tactical Air Navigation
TAS —   True Airspeed
TAT —   Total Air Temperature
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TEMP —  Temperature
TER —  Terrain
TERM —  Terminal
TKE —  Track Angle Error
TMA —   ICAO Terminal Control Area
TRANS —  Transition
TRFC —  Traffic
TRK —   Track (also Ground Track) Angle
TRSA —   Terminal Radar Service Area
twr —  Tower
TX —  Transmit
uni —  Unicom UTC —   Coordinated Universal Time (also 
GMT or “zulu”)
UTM/UPS —   Universal Transverse Mercator / 
 
  Universal Polar Stereographic grids
VAL —   Vertical Alarm Limit
VAR —  Variation
VER —  Version
VFOM —   Vertical Figure of Merit
VFR —   Visual Flight Rules
VLOC —   VOR/Localizer Receiver
VNAV —   Vertical Navigation
VOL —  Volume
VOR —   VHF Omnidirectional Radio Range
VPL —   Vertical Protection Level VS —  
Vertical Speed
VSR —   Vertical Speed Required
WAAS —   Wide Area Augmentation System
WPT —  Waypoint
WX —  Weather
XTK —   Crosstrack Error
12 - MESSAGES
ABBREVIATIONS &  NAV TERMS 
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