CAUTION - MAST HEIGHTS
Vessels with mast heights in excess of 38.1 meters/125 feet shall pass 91.44 meters/100 yards to the north of East River Main Channel Lighted Buoy 5 so as to avoid vessel interference with aircraft on the glide path to the northeast - southwest runway of La Guardia Airport. Vessels transiting South Brother Island Channel and using the turning basin at its southern terminus shall ballast prior to entry, and are cautioned that mast heights in excess of 38.1 meters/125 feet may penetrate the glide path to the northwest - southeast runway to La Guardia Airport. If mast heights cannot be lowered below 38.1 meters/125 feet, La Guardia Air Traffic Control Tower shall be notified by phone prior to terminal departure or channel entry.