TAB files

TAB file are HCRF files that store pre-recorded country information, horizontal datum, vertical datums, etc in the HCRF chart during export. TAB files are included in a distribution when one is created.

HCRF values in the mapping files should match those values in the TAB files otherwise the resulting HCRF charts will be incorrect.

There are six TAB files:

• VERDAT.TAB (vertical datums)

• COUNTRY.TAB (country information)

• HORDAT.TAB (horizontal datums)

• NOTETYPE.TAB (note types)

• PROJCODE.TAB (chart projections)

• UNIT.TAB (units)

All rows in TAB files have the same format, the first 3 characters store the code, the next 30 characters contain the description.

GB

CODE Name

For example, from VERDAT.TAB

where 00 is CODE and Unspecified is Name.

• CODE starts at column 1 and ends at column 3.

• Name starts at column 4 and ends at column 33.