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b. Coordinate values in degrees and minutes - use 11 characters. Describe:latitude in 4 figures followed by a "N" or "S"
longitude in 5 figures followed by a "E" or "W"
For even degrees of latitude and longitude use 7 characters. Describe:latitude in 2 figures followed by a "N" or "S"
longitude in 3 figures followed by a "E" or "W".
Use zeros when necessary to make up the 7 characters (55N060W) or 11 characters (4620N07805W).
c.  Bearing and Distance - Enter the:
Identification of the Navigational Aid (2 or 3 characters)
Bearings in 3 figures
Distance in 3 figures

Use zeros when necessary to make up 3 figures for bearing and distance, e.g., DUB090040.
CHANGE OF SPEED OR LEVEL (maximum 21 characters) - An entry must be made under the route of flight whenever a change to the cruising speed (5% TAS or 0.01 MACH or more) or the cruising level is planned, the entry will consist of:
The point described (from Significant Points entry) followed by a "/" then, the cruising speed planned from that point (from Cruising Speed entry), followed without a space by the cruising level (4 characters) planned to be initiated from the point described (from Cruising Level entry).
VH/N0284A045  GEO/N0305F180 WHITE/N0420F330
4602N07805W/N0500F350 46N078W/M082F330 DUB180040/N0350F330
CHANGE OF FLIGHT RULES - An entry must be made for each point where a change of flight rules is planned to be initiated. The entry consists of the description of the point (described from the Significant Points and Change of Speed or level entries) followed with a space by:
"VFR" if the flight changes from IFR to VFR, e.g., VH VFR, or
"IFR" if the flight changes from VFR to IFR, e.g., VH/N0284A050 IFR.
CRUISE CLIMB - Enter the letter "C" followed by a "/"; then the point at which the cruise climb is planned to start (described from Significant Points entry), followed by a "/"; then the speed to be maintained during cruising climb (described from Cruising Speed entry), followed by the two levels defining the layer to be occupied during cruise climb, each level (described from Cruising Level entry), or the level above which cruise climb is planned, followed by the word "PLUS" without a space between them, e.g.,
C/48N050W/M082F290F350  C/48N050W/M082F290PLUS
C/52N050W/M220F580F620
Item 16
DESTINATION AIRPORT, TOTAL ESTIMATED ELAPSED TIME, AND ALTERNATE AIRPORT(S). - Enter the 4 letter ICAO identifier of the destination airport followed by, without a space, the total estimated elapsed time.
If there is no assigned location identifier, enter "ZZZZ". When "ZZZZ" is used, add "DEST/" in Item 18 followed by the airport name, heliport, field site or grid coordinates.
The total estimated elapsed time for IFR flights is the estimated time required from take-off to arrive over that designated point, defined by reference to Navigational Aids, from which it is intended that an instrument approach procedure will be commenced or, if no Navigational Aid is associated with the destination airport, to arrive over the destination airport.
DD FORM 1801  4-39

For VFR flights, it is the estimated time required from take-off to arrive over the destination airport. For a flight plan received from an aircraft in flight, the total estimated elapsed time is the estimated time from the first point of the route to which the flight plan applies.
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ALTERNATE AIRPORT(S) - Enter the 4 letter ICAO location identifier-(s) of not more then two alternate airports, separated by a space. If there is no assigned location identifier, enter "ZZZZ". When "ZZZZ" is used, add "ALTN/" in item 18 followed by the name of the airport.
　
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