Network node files (NDESEW**.DAT and NDESWE**.DAT)
Number of header records: 2
Length of data record: Variable (35, 68, 98, or 128 bytes, depending on whether 0, 1, 2, or
3 routes can be followed from a given node)
Table B.7. Data record format specifications for network node files.
Data
First byte
Last byte
Format
Record number
1
2
I2
Node or data point identification
3
5
A3
Leg identification
6
16
A11
Latitude of
Degree
17
19
I3
node
Minutes
20
22
I3
Longitude of Degree
23
26
I4
node
Minutes
27
29
I3
Number of possible routes (branches) to follow
30
33
I4
If the number of branches is greater than zero, then one block of data is given for each
branch describing which node to head for.
First
Record number of next node
34
36
I3
branch
Identification of next node
37
39
A3
(if
Probability of using route
40
44
F5.2
there
Probability of icebreaker escort
45
51
F5.2
is
Distance to next node (nm)
52
58
F7.2
one)
Initial heading to next node (deg)
59
66
F7.2
Second
Record number of next node
67
69
I3
branch
Identification of next node
70
72
A3
(if
Probability of using route
73
77
F5.2
there
Probability of icebreaker escort
78
82
F5.2
is
Distance to next node (nm)
83
89
F7.2
one)
Initial heading to next node (deg)
90
96
F7.2
Third
Record number of next node
97
99
I3
branch
Identification of next node
100
102
A3
(if
Probability of using route
103
107
F5.2
there
Probability of icebreaker escort
108
112
F5.2
is
Distance to next node (nm)
113
119
F7.2
one)
Initial heading to next node (deg)
120
126
F7.2
Carriage control characters come only once, at the end of the record; the length of the
record and the position of the carriage control characters depend on the number of
branches.
If no branches
34
35
Carriage control characters
If one branch
67
68
A2
(hex 0D0A)
If two branches
97
98
If three branches
127
128
65
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