Temporary for a specific time period for the following:

  1. Artillery shooting areas
  2. A failure of a lighthouse or racon of any ATON (Lighthouse or Buoys).
  3. Petroleum search operations within a certain concession area.
  4. (Broadcasted through radio stations) .

Navigational Alerts (Navigational Notices), permanent for the following :

  1. Fixing marine petroleum platforms.
  2. Marine communication cable.
  3. A submerged floating unit not salvaged or grounded.
  4. Any marine Installation jeopardizing safety of navigation