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AIM 

6/17/21 

d.  Oakland Oceanic FIR. 

The use of CPDLC and 

ADS

C in the Oakland Oceanic FIR (KZAK) is only 

permitted by Inmarsat and Iridium customers. All 
other forms of data link connectivity are not 
authorized. Users must ensure that the proper data 
link code is filed in Item 10a of the ICAO FPL in order 
to indicate which satellite medium(s) the aircraft is 
equipped with. The identifier for Inmarsat is J5 and 
the identifier for Iridium is J7. If J5 or J7 is not 
included in the ICAO FPL, then the LOGON will be 
rejected by KZAK and the aircraft will not be able to 
connect. 

e.  New York Oceanic FIR.

 The use of CPDLC 

and ADS

C in the New York Oceanic FIR (KZWY) 

is only permitted by Inmarsat and Iridium customers. 
All other forms of data link connectivity are not 
authorized. Users must ensure that the proper data 
link code is filed in Item 10a of the ICAO FPL in order 
to indicate which satellite medium(s) the aircraft is 
equipped with. The identifier for Inmarsat is J5 and 
the identifier for Iridium is J7. If J5 or J7 is not 
included in the ICAO FPL, then the LOGON will be 
rejected by KZWY and the aircraft will not be able to 
connect. 

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2.  Position Reporting 

The safety and effectiveness of traffic control 
depends to a large extent on accurate position 
reporting. In order to provide the proper separation 
and expedite aircraft movements, ATC must be able 
to make accurate estimates of the progress of every 
aircraft operating on an IFR flight plan. 

a.  Position Identification. 

1. 

When a position report is to be made passing 

a VOR radio facility, the time reported should be the 
time at which the first complete reversal of the 
“to/from” indicator is accomplished. 

2. 

When a position report is made passing a 

facility by means of an airborne ADF, the time 
reported should be the time at which the indicator 
makes a complete reversal. 

3. 

When an aural or a light panel indication is 

used to determine the time passing a reporting point, 
such as a fan marker, Z marker, cone of silence or 
intersection of range courses, the time should be 
noted when the signal is first received and again when 
it ceases. The mean of these two times should then be 
taken as the actual time over the fix. 

4. 

If a position is given with respect to distance 

and direction from a reporting point, the distance and 
direction should be computed as accurately as 
possible. 

5. 

Except for terminal area transition purposes, 

position reports or navigation with reference to aids 
not established for use in the structure in which flight 
is being conducted will not normally be required by 
ATC. 

b.  Position Reporting Points. 

CFRs require 

pilots to maintain a listening watch on the appropriate 
frequency and, unless operating under the provisions 
of subparagraph c, to furnish position reports passing 
certain reporting points. Reporting points are 
indicated by symbols on en route charts. The 
designated compulsory reporting point symbol is a 

solid triangle  

  and the “on request” reporting 

point symbol is the open triangle 

. Reports 

passing an “on request” reporting point are only 
necessary when requested by ATC. 

c.  Position Reporting Requirements. 

1.  Flights Along Airways or Routes. 

position report is required by all flights regardless of 
altitude, including those operating in accordance with 
an ATC clearance specifying 

“VFR

on

top,”

 over 

each designated compulsory reporting point along the 
route being flown. 

2.  Flights Along a Direct Route. 

Regardless 

of the altitude or flight level being flown, including 
flights operating in accordance with an ATC 
clearance specifying “

VFR

on

top,”

 pilots must 

report over each reporting point used in the flight plan 
to define the route of flight. 

3.  Flights in a Radar Environment. 

When 

informed by ATC that their aircraft are in “Radar 
Contact,” pilots should discontinue position reports 
over designated reporting points. They should 
resume normal position reporting when ATC advises 

RADAR CONTACT LOST”

 or “

RADAR SERVICE 

TERMINATED.” 

4.  Flights in an Oceanic (Non-radar) Envi-

ronment.

 Pilots must report over each point used in 

the flight plan to define the route of flight, even if the 
point is depicted on aeronautical charts as an “on 
request” (non-compulsory) reporting point. For 
aircraft providing automatic position reporting via an 
Automatic Dependent Surveillance-Contract 

En Route Procedures 

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