INT 1 · D 26
Overhead power line and clearance
Areas & limitsCore
Pylon positions and a marked transmission line show an overhead crossing and its clearance.
What it means
Pylon positions joined by a power-transmission line identify an overhead crossing. The chart distinguishes the physical height from any charted vertical clearance.
Why it matters
Compare the correct clearance datum with actual water level and the vessel's complete air draught, allowing for waves and vessel motion. High-voltage lines can arc before contact.