Add Feature and Attribute Code Entries

S-57 files do not contain feature or attribute acronyms directly. Instead they contain numeric codes that are matched to the feature or attribute acronym. When an S-57 file is read or written, the application looks up the feature acronym matching the code and vice versa.

All numeric codes must be unique.

There are two lookup files:

• obj_lut.txt matches feature acronyms to numeric codes

• att_lut.txt matches attribute acronyms to numeric codes

Both files are located in C:\Program Files\CARIS\HPD\<version>\system\S57Config\system.

This is an example of obj_lut.txt:

The features and attributes in the catalogue must have unique numeric codes. Every feature and attribute acronym has to be added to these files and assigned a numeric value.

To edit the catalogue:

1. Open obj_lut.txt.

2. Add these two lines:

3. Save and close the file.

Repeat for attribute acronyms in att_lut.txt. Each attribute must be added and assigned a unique numeric code.

4. Save and close the file.