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Special Mark Buoy

Special Mark Buoy is used to indicate a special area or feature whose nature may be apparent from reference to a chart or other nautical publication. It is not generally intended to mark channels or obstructions where other marks are more suitable.

BASIC INFO

Introduction :

Special Mark Buoy is used to indicate a special area or feature whose nature may be apparent from reference to a chart or other nautical publication. It is not generally intended to mark channels or obstructions where other marks are more suitable.

Special mark buoy can be used to show the following:

– Ocean Data Acquisition Systems (ODAS) marks
– Traffic separation marks where use of conventional channel marking may cause confusion.
– Spoil Ground marks
– Military exercise zone marks
– Cable or pipeline marks
– Recreation zone marks
– Boundaries of anchorage areas
– Structures such as offshore renewable energy installations
– Aquacultures.

Description :

Special Mark Special Mark Buoy  
Colour Yellow
Buoy Shape Optional but not conflicting with navigational marks
Topmark (if any) Single yellow ‘X’ shape (St Andrew’s Cross)
Light Colour (when fitted) Yellow
Light Rhythm (when fitted) Any other than those described in cardinal, isolated danger and safe water marks

Specification :

Model Diameter
(mm)
Buoying Depth (mm) Freeboard
(mm)
Focal Plane Height (mm) Net Weight
(kg)
Height
(mm)
Reserve Buoyancy (kg)
SM800 800 2-10 45 1580 195 2628 230
SM1200 1200 3-15 510 2040 550 3380 570
SM1500 1500 4-20 632 2524 681 4300 1012
SM1800 1800 6-30 722 3031 1686 5134 1546
SM2100 2100 8-40 800 3518 1900 5757 2450
SM2400 2400 10-50 920 4040 2973 6930 4015
SM3050 3050 15-60 1114 5164 3490 9610 7646
SM3500 3500 20-70 1240 6090 3863 8520 11380
Hall Thickness Mooring Chain Sinker Specification The Maximum swaying angle≤15°
Buoy (m) Thickness (mm) Buoy (m) Mooring Chain (mm) Buoy (m) Sinker (t)
1.2 10 1.2 17.5 1.2 0.5-1
1.5 10 1.5 22 1.5 1-1.5 Sunproof grade:8
1.8 15 1.8 28 1.8 2-3
2.4 15 2.4 32 2.4 3-6
3 15 3 38 3 5-8
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