IMO Activities Relating to the Maritime Use of Global Navigation Satellite Systems

1
IMO Activities Relating to the Maritime Use of
Global Navigation Satellite Systems

• LCDR William Burns
• Office of Aids to Navigation
• U.S. Coast Guard Headquarters

2
Evolution of Current Policy

• For maritime users, IMO is the international
  organization that will recognize a GNSS as a
  system which meets the carriage requirements for
  position-fixing equipment for a World-Wide
  Radionavigation System (WWRNS)

3
Evolution of Current Policy

• IMO Resolution A.815(19)
• Recognition by IMO of a radionavigation system
  would mean that the Organization accepted that
  the system is capable of providing adequate
  position information within its coverage area and
  that the carriage of receiving equipment for use
  with the system would satisfy the relevant
  requirements of the 1974 SOLAS Convention.
• The provision and operation of a radionavigation
  system is the responsibility of the Governments
  or organizations concerned.

4
Current Policy

• IMO Resolution A.815(19)
• Established Operational Requirements
• Accuracy
• Signal Availability
• Service Reliability (Continuity)
• Coverage Area
• Update Rate of Position Data
• Warning of System Malfunction

5
IMO Resolution A.815(19)

• IMO recognized the GPS Standard Positioning
  Service as a component of the World-Wide
  Radionavigation System (WWRNS) for maritime
  interests in June 1996
• IMO also recognized GLONASS as a component of the
  WWRNS in December 1996

6
Path for System Recognition
7
Factors for System Recognition

• In deciding whether or not to recognize a
  radionavigation system, IMO considers
• The Government or organization providing and
  operating the system has stated formally that the
  system is operational and available for use
• Its continued provision is assured
• It meets the prescribed accuracy, availability,
  reliability (continuity), etc.
• Adequate arrangements have been made for
  publication of the characteristics and parameters
  of the system and its status
• Adequate arrangements have been made to protect
  the safety of navigation should changes be made
  in the system

8
Outlook

• The long period required to develop and implement
  a GNSS has led the Organization to formulate the
  maritime requirements for future GNSS(s) at an
  early stage
• The Sub-committee on Safety of Navigation
  recently reviewed IMO Resolution A.860(20) on
  Maritime Policy for a Future GNSS and submitted
  the revision to the Maritime Safety Committee

9
IMO Resolution A.860(20)

• Recognized 3 major needs for new policy
• Need for a future civil and internationally-contr
  olled GNSS
• Needs for a future GNSS are not restricted to
  general navigation only
• Need to identify early the maritime user
  requirements
• for a future GNSS

10
A.860(20) Service Level Parameters

• Availability ( per 30 days) 99.8 (for all
  phases of navigation)
• Continuity ( over 3 hours) 99.97 (for Port
  approach and restricted waters, Port, and Inland
  waterways)Continuity is not relevant to ocean
  and coastal navigation
• Coverage Global for Ocean and CoastalRegional
  for Port approach and restricted waters, and
  Inland waterwaysLocal for Port
• Fix interval (seconds) One second for all
  phases of navigation

11
A.860(20) System Level Parameters

• Absolute Accuracy 10 meters horizontally (for
  Ocean, Coastal, Port approach and restricted
  waters, and Inland waterways) 1 meter
  horizontally (for Port)
• IntegrityAlert limit 25 meters (for Ocean,
  Coastal, Port approach and restricted waters, and
  Inland waterways) 2.5 meters (for Port)
• Time to alarm 10 seconds (for all phases of
  navigation)
• Integrity risk (per 3 hours) 10-5 (for all
  phases of navigation)