Attribute: Vertical clearance, safe
Attribute type: F
The safe vertical clearance measured from the plane towards the object overhead.
# Must be encoded for CBLOHD objects over navigable water, or if this is unknown, encode attribute VERCLR.
INT 1: ID 26;
Minimum Value: 0
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
7.2 for a vertical clearance of 7.2 metres.
In the case of cables carrying high voltages, the quoted vertical clearance (VERCLR) may have to be reduced by 2-5m to avoid electrical discharge. When known, this authorized safe clearance (known in the UK as the Safe Overhead Clearance) which is the physical clearance minus a safety margin shall, be stated. (IHO Chart Specifications, S-4).
See also 'Vertical Clearance'