4 – Operating Procedure
4-10
© Teledyne Limited
DPN 402197 Issue 7.1
NOTE
❐
The Start character is a colon.
❐
The number of coils in the 350 system is always 6.
❐
Coil altitude (ALT) information comes from an altimeter if the system includes
one. Otherwise, the information in this field will be the fixed coil height if
available. If there is no altitude information available the field will contain
three space characters and a zero.
❐
The lateral offset (LAT) is measured from the centre of the coil array. Positive
values indicate a target to starboard of the centre line. The field will contain
question marks if the target is out of range.
❐
The vertical range to target (VRT) is the distance between the reference line
of the coil array (identified in Figure 3-2) and the target. The value is always
positive. There are several conditions that will cause the field to contain
question marks:
❐
The target is out of range
❐
The 350 system cannot compute an accurate position for the target
❐
Coil saturation has occurred because the tone signal is too strong
❐
Skew angle between the target and the ROV in the range –90° to +90°. Zero
skew is the ideal situation where the ROV aligns on the same heading as the
direction of the target. Skew is positive when the ROV heading is to star-
board of the target direction. The field will contain question marks if the 350
system cannot measure the skew angle.
A2) Co-ordinates Data Packet – Forward Search mode
The string is 23 characters long with individual field definitions as follows. DeepView logs all distances
in units of centimetres and skew angles in units of degrees. The values in the packet are rounded and
it is possible that they will not precisely match those on the Forward Search Window.
Table 4-6: Internal logging format – Forward search mode
