The vertical clearance measured from the horizontal plane towardsa fixed (non-opening) feature overhead.
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In the case of cables carrying high voltages an additional clearance of from 2 to 5 metres may be needed toavoid an electrical discharge. When known, the authorised safe clearance (known in the UK as the SafeOverhead Clearance) which is the physical clearance minus a safety margin shall be stated, using theattribute vertical clearance safe. vertical clearance fixed must not be used to populate authorized safe clearances
On behalf of the IHO Member States, the International Hydrographic Bureau would like to thank Korea Hydrographic and
Oceanographic Agency(KHOA) of the Republic of Korea for giving active support in the development of the S-100 GI Registry