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7 – Operating Procedure

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❐ The data logged to an external logger

❐ The video recording of the 350 System installation and configuration procedures

(if one has been made)

❐ The video recordings from cameras on board the ROV

❐ Details of any events, such as ROV collisions, that may have occurred during the

survey, and the effect that they may have had upon the survey. You should also

record any corrective action taken.

❐ Printed or hand-written sheets containing the System configuration details that

were taken at the start and at the end of the survey

❐ Any other information requested by the survey planning team

7.2.3 Replay Logged Data

You cannot use the display software on the SDC to replay externally logged files.

To replay a previously logged data file you have to select Open/Close Replay file [F2]

from the file option from within DeepView for Windows. This will provide you with the

following dialog box to select the file you require. The location of these files by default

is a Logs folder within the DeepView for Windows directory, but this can be changed

by the user to another directory, or to a floppy disk in drive A of the SDC.

❐ Externally logged data files include data packets of fixed length that supply all the

information required for a full analysis of the survey. The file includes target co-

ordinates, signal values and important quality control information generated by the

350 System during the survey. You should use this logging method to generate

the primary survey recording.

Externally logged files will usually be stored on a separate data logger along with

files generated by other items of survey equipment. The data logger will time

stamp data packets that it receives so that the records may be synchronised accu-

rately during the analysis operation. For this reason, DeepView does not include a

time field in the external data packets. Refer to sub-section 6.2.2.2 for a descrip-

tion of the external logging format.

❐ Internally logged files are of variable length and include all data transmitted to the

SDC by the SEP (target co-ordinates, signal values and, possibly, information

needed by the Scope and Spectrum Analyser window). The data packets also

include comment lines that describe the SEP type and other System information,

a time stamp and any text annotations supplied by the user. The internal logging

format does NOT include the quality control information.

Refer to sub-section 7.3.2 for a description of the internal logging format.

The internal logging facility is for test purposes and for the convenience of operators

only. You should not use it to record the main survey log.

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