DIR: Direction Observation

This record specifies a horizontal direction observation. Each set of direction observations must begin with a DSET record. Please see the DSET record documentation for information about the required structure of direction set measurements.

All direction observations in a set must have the same from-station. Only HI and HT records may be placed within a set of DIR records (if a valid record of any other type is encountered, the set of directions is terminated). A sigma-record (SIGM) may be identified on the DSET record.

This record has two possible formats, a long parameter name format, and a short parameter name format. If column 10 contains an asterisk (*) the long name format is expected, otherwise the short name format is expected.

The short parameter name format is as follows:

Columns 002-005: DIR

Columns 010-010: (blank)
Columns 011-022: From-station name
Columns 024-035: To-station name
Columns 050-050: Sign (-/+/space) of direction observation
Columns 051-053: Degrees of direction observation
Columns 055-056: Minutes of direction observation
Columns 058-064: Seconds of direction observation
Columns 066-075: Standard deviation of direction observation (seconds)

The long parameter name format is as follows:

Columns 002-005: DIR
Columns 010-010: * (asterisk)
Columns 011-041: From-station name
Columns 043-073: To-station name
Columns 075-075: Sign (-/+/space) of direction observation
Columns 076-078: Degrees of direction observation
Columns 080-081: Minutes of direction observation
Columns 083-089: Seconds of direction observation
Columns 091-100: Standard deviation of direction observation (seconds)