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6/17/21 

AIM 

TBL 5

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Lateral Downlink Message Elements (LATD) 

CPDLC Message Sets 

Operational Definition in PANS

ATM (Doc 4444) 

FANS 1/A 

ATN B1 

Response 

Message 
Element 

Identifier 

Message Element 

Intended Use 

Format for 

Message Element 

Display 

DM59 DIVERTING 

N/A 

N

LATD

Report indicating 

DIVERTING TO 

TO 

(position) 

VIA 

diverting to the 

(position) 

VIA 

(en

 

(route clearance) 

specified position 

route data) (arrival 

Note 1. 

 H alert at-

via the specified 

approach data[O]) 

tribute 

route, which may 

Note 2. 

 N

be sent without any 

 response attribute 

previous coordina-
tion done with 
ATC. 

DM60 

N/A 

N

LATD

Report indicating 

OFFSETTING 

OFFSETTING 

that the aircraft is 

(specified distance) 

(distance offset) 

offsetting to a par-

(direction) 

(direction)

 OF 

allel track at the 

OF ROUTE 

ROUTE 

specified distance 

Note 1. 

 H alert at-

in the specified di-

tribute 

rection off from the 

Note 2. 

 N

cleared route. 

 response attribute 

DM80 DEVIATING 

N/A 

N

LATD

Report indicating 

DEVIATING 

(deviation offset) (di-

deviating specified 

(specifiedDevia-

rection)

 OF ROUTE 

distance or degrees 

tion) (direction)

 OF 

Note 1. 

 H alert at-

in the specified di-

ROUTE 

tribute 

rection from the 

Note 2. 

 N response 

cleared route. 

attribute 

ICAO Document 10037, Global Operational Data Link (GOLD) Manual has these values set to Y in their table. 

TBL 5

3

Level Uplink Message Elements (LVLU) 

CPDLC Message Sets 

Operational Definition in PANS

ATM (Doc 4444) 

FANS 1/A 

ATN B1 

Response 

Message 
Element 

Identifier 

Message Element 

Intended Use 

Format for 

Message Element 

Display 

UM19 MAINTAIN 

(altitude) 
Note 

 Used for a sin-

gle level 

UM19 
MAINTAIN 

(level) 

W/U 

LVLU

Instruction to 
maintain the speci-
fied level or verti-
cal range. 

MAINTAIN 

(level) 

UM20 CLIMB TO 
AND MAINTAIN 

(altitude) 
Note 

 Used for a sin-

gle level 

UM20 CLIMB TO 
(

level

W/U 

LVLU

Instruction that a 
climb to the speci-
fied level or verti-
cal range is to 
commence and 
once reached is to 
be maintained. 

CLIMB TO (

level

En Route Procedures 

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