Transport Publication - TP 10038 E (2003)
Diving
Code Flag A
This flag indicated, "I have a diver down. Keep well clear at slow speed." Collision Regulations require that small vessels engaged in diving operations must display a rigid replica of this flag when restricted in their ability to manoeuvre.
Diving Buoy Flag
This flag is required by Private Buoy Regulations and indicates areas where scuba diving is in progress. Again, stay well clear and proceed with caution.