User`s manual

DATA STORAGE FILE FORMAT (.81S) (con't)
47-58 GPS Ships Position Latitude – text string (12 bytes)
“_dd.mm.xxx_N”
dd = Degrees
mm = Minutes
xxx = Decimal Minutes _
= Space
N = North or S = South
59-70 GPS Ships Position Longitude – text string (12 bytes)
“ddd.mm.xxx_E”
ddd = Degrees
mm = Minutes
xxx = Decimal Minutes
_ = Space
E = East or W = West
71-72 Repetition Rate – Time between pings
Byte 71 Byte 72
7 7
Repetition Rate
73 GPS Ships Speed
Speed = (Byte 73)/10 in knots
74-75 GPS Ships Heading
Byte 74 Byte 75
7 7
Heading * 10 (in degrees)
76 Operating Frequency
0 = Low Frequency 1 =
High Frequency
77-99 Reserved - always 0
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