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DATA STORAGE FILE FORMAT (.852) (con't)
6-7
nToRead
- Number of Bytes from the sonar or echo sounder
Byte 6
Byte 7
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
13 (for IPX), 265 (for IMX) or 513 (for IGX)
8-19
Date
- null terminated date string (12 bytes)
"
DD-MMM-YYYY
"
20-28
Time
- null terminated time string (9 bytes)
"
HH:MM:SS
"
29-32
Hundredth of Seconds
- null terminated string (4 bytes)
"
.hh
"
33-36
Reserved
– always 0
37
Dir, Xdcr, Mode, Step
For Sonar Head (Head ID = 0x10):
Byte 37
7
6
5
4
3
2
1
0
Dir
Xdcr
Mode
Step Size
0=ccw
1=cw
0=Dn
1=Up
0 = Sector (IGX)
1 = Polar (IMX)
0 = 2.25 Deg (Slow)
1 = 4.5 Deg (Fast)
For Echo Sounder (Head ID = 0x11):
Byte 37
7
6
5
4
3
2
1
0
N/A
N/A
Mode
N/A
0
0
0 = IGX
1 = IMX
0
38
Start Gain
0 to 40 in 1 dB increments
39
(Sector Size)/3
For Sonar Head (Head ID = 0x10):
0 to 102 = 0 to 306 Degrees in 3 degree increments
For Echo Sounder (Head ID = 0x11):
Reserved – always 0
