Attribute: Horizontal clearance
Attribute type: F
The width of an object, such as a canal or a tunnel, which is available for safe navigation. This may, or may not, be the same as the total physical width of the object.
ENC Condition:# Must be encoded for GATCON objects if navigable at compilation scale.
Minimum Value: 0
INT 1: ID 21;
Unit: defined in the HUNI subfield of the DSPM record or in the HUNITS attribute of the M_UNIT meta object class, e.g. metre (m)
Resolution: 0.1 m or 0.1 ft
125 for a width of 125 metres.