Attribute: Vertical clearance, safe

Acronym: VERCSA

Code: 184

Attribute type: F


The safe vertical clearance measured from the plane towards the object overhead.

ENC Condition:

# Must be encoded for CBLOHD objects over navigable water, or if this is unknown, encode attribute VERCLR.


INT 1: ID 26;

S-4: 382.1;

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'