1. MARITIME NAVIGATION Radar
Vladimir LEBEDEV
Senior Technical Officer
MARITIME SAFETY DIVISION
Hello
Personal introduction.
This presentation will address:
the background to the IMO position on maritime security
The measures required by SOLAS and the ISPS Code
The responsibilities of governments, ports and companies
Some implementation strategies

2. History…
New technologies of Radar become available to Merchant Shipping with the end of hostilities in 1945
Radar on Merchant Ships was initially installed for commercial purposes
on ferries to maintain better schedules in fog; and
large fishing vessels
Radar was treated with great suspicion by the mariners…

3. History…
With improving technology and after some time the use of Radar for safety purposes was recognized
Misinterpretation of Radar information had not resulted in any reduction of the number of serious collisions at sea

4. History…
International Conference on Safety of Life at Sea in 1960 revised the International Regulations for Preventing Collisions at Sea by adding rules to take account of the use of Radar and recommendations on the use of Radar information as an aid to avoiding collisions at sea

5. History…
The International Conference on Safety of Life at Sea in 1974 adopted provisions to the SOLAS Convention making Radar a mandatory carriage requirement for Merchant Ships in a phased programme starting in 1980, which finally completed in 2002

6. SOLAS requirements…
All Merchant Ships of 300 gross tonnage and over now shall carry a Radar and many carry two
IMO adopted performance standards for marine Radars, which are used in connection/integration with other navigational equipment required to carry on board ships such as,

7. SOLAS requirements… - an automated target tracking aid - ARPA - AIS
- ECDIS
- GNSS
- others

8. NON-SOLAS ships
Many small craft (millions?) also carry Radar voluntary as manufacturers have produced cost effective designs for their needs

9. The Shipmaster’s Point of View
The Key Facts are:
That Radar remains (and will remain) the primary system for Collision Avoidance; and
Radar is a very important tool for Navigation

10. Why is Radar such a valuable tool?
The Master and watch-keepers have Confidence in information Radar provides because:
It’s operation is Ship based
It’s not reliant on third party sources
It has a proven track record
Radar is useful with SARTs when engaged in search and rescue

11. In Short…
In its display, Radar offers the watch-keepers the basic reality of all targets relative to the ship
It therefore aids the watch-keepers and helps in decision making for both
Navigation; and
Collision Avoidance

12. COLLISION AVOIDANCE
Early action is required to avoid a close quarters situation, therefore early identification of closing targets is essential
Watch-keeping officers need to be competent in the use of Radar and are trained in its use and the application of ARPA

13. Some IMO requirements…
Maximum emergency stopping distance from full speed of the ship should not be more that 15 ships lengths
Emergency turn radius of the ship should not be more that 2.5 ships length

14. Ship parameters… Speed – up to 25 knots Length
Largest container ship 335 m
Capesize bulker 300 m
Panamax m

15. Ship parameters… Emergency stopping distance
3.3 km – 5 km (1.8 nm – 2.7 nm)
Emergency turning radius
550 m – 840 m (0.3 nm – 0.45 nm)
Displacement weights
– tonnes

16. Practical requirements
To start plotting targets and determining their course and speed when the target is between 8 and 10 nautical miles off

17. NAVIGATION
Radar gives accurate information on distance from charted features and assists in maintaining the ship’s course
Radar will normally show a 60 metre high land mass at a range of 20 miles. This is considered by seafarers as a minimum requirement

20. Height above sea level in metres
Res. MSC. 192(79)
Target Description
Target Feature
Detection Range in NM6
Target description5
Height above sea level in metres
X-Band NM
S-Band
Shorelines
Rising to 60 20
Rising to 6 8
Rising to 3 6
SOLAS ships (>5,000 gross tonnage) 10 11
SOLAS ships (>500 gross tonnage)
5.0
Small vessel with radar reflector meeting IMO Performance Standards1
4.0
3.7
Navigation buoy with corner reflector2
3.5
4.9
3.6
Typical Navigation buoy3
4.6
3.0
Small vessel of length 10 m with no radar reflector4
2.0
3.4

21. Discrimination of targets from a watch-keepers perspective
To be able to distinguish a tug from its tow at sea at 12 miles range
Approaching a rig on a supply vessel:
To clearly identify the standby boat from the rig at 6 miles range
To be able to distinguish the anchor pennant buoys of a semi submersible rig at 3 miles range

25. Res. MSC.192(79) 5.5.1 Range 5.5.2 Bearing
The radar system should be capable of displaying two point targets on the same bearing, separated by 40 m in range, as to distinct objects.
5.5.2 Bearing
The radar system should be capable of displaying two point targets on the same range, separated by 2.5° in bearing, as to distinct objects.

28. NAVIGATION Radar greatly assists navigation during poor visibility
Pilots rely on Radar at close range in reduced visibility to pass buoys and beacons.

33. Res.MSC.192(79) 5.4 Minimum Range
5.4.1 With own ship at zero speed, an antenna height of 15 m above the sea level and in calm conditions, the navigational buoy in Table 2 should be detected at a minimum horizontal range of 40 m from the antenna position and up to a range of 1 NM, without changing the setting of control functions other than the range scale selector.

34. In engineering terms Res. ITU-R M.1313 Power 30-70 kW
Horizontal Beamwidth 0.75 – 4 degrees
Pulse width 0.03 – 1.2 microsec
PRF – 375 Hz
Noise figure 3 – 8 dB

35. Antennae Pitch 3 degrees Roll 25 degrees Yaw 5 degrees
So vertical beamwidth 20 – 30 degrees

37. WP 8B Report Nov 03

38. WP 8B 2001

39. WP 8B 2001

47. Thank you!