Chart symbols

Question 1

Answer 1

Flood tide stream with mean spring rate

Ebb tide stream with mean spring rate

Question 2

Answer 2

Current in restricted waters

Question 3

Answer 3

Position approximate

Position doubtful

Question 4

Answer 4

Dangerous cargo berth

Question 5

Answer 5

Overfalls, tide rips, races

Question 6

Answer 6

Eddies

Question 7

Answer 7

Existence doubtful

Sounding of doubtful depth

Reported, but not confirmed

Reported (with year of report), but not confirmed

Question 8

Answer 8

No bottom found at depth shown

Question 9

Answer 9

Drying heights and contours above chart datum

Question 10

Answer 10

Dredged channel or area with minimum depth maintained

Question 11

Answer 11

Sand
Mud
Clay
Silt
Stones
Gravel

Question 12

Answer 12

Pebbles
Cobbles
Rock; Rocky
Boulder(s)
Coral, coralline algae
Shells (skeleton remains)
Two layers, e.g. sand over mud

Question 13

Answer 13

Weed (including kelp)
Kelp, weed
Seagrass

Question 14

Answer 14

Fine
Medium
Coarse
Broken
Sticky
Soft
Stiff
Volcanic
Calcareous
Hard

Question 15

Answer 15

Depth swept by wire drag or confirmed by diver

Safe clearance depth, exact depth unknown

Question 16

Answer 16

Rock awash at chart datum

Question 17

Answer 17

Coral reef which is always covered

Question 18

Answer 18

Wreck, hull never covers, height above chart datum

Wreck, covers and uncovers, height above chart datum

Question 19

Answer 19

Submerged wreck, depth known

Submerged wreck, depth unknown

Question 20

Answer 20

Wreck showing any part of hull or superstructure at chart datum

Wreck of which only mast is visible at chart datum

Question 21

Answer 21

Wreck, least depth known by sounding only

Wreck, depth swept by wire drag or confirmed by diver

Question 22

Answer 22

Dangerous wreck, depth unknown

Sunken wreck, not dangerous to surface navigation

Question 23

Answer 23

Wreck over which the exact depth is unknown, safe clearance at depth shown

Question 24

Answer 24

Foul ground

Question 25

Answer 25

Obstruction, depth unknown

Question 26

Answer 26

Obstruction, least depth known by sounding only

Question 27

Answer 27

Obstruction, depth swept by wire drag or confirmed by diver

Question 28

Answer 28

Mandatory direction of traffic flow Recommended direction of traffic flow Separation line Separation zone

Question 29

Answer 29

Precautionary area

Question 30

Answer 30

Radio reporting points showing directions of vessel movement with designation and VHF channel Radio reporting line

Question 31

Answer 31

Prohibited area

Question 32

Answer 32

Reported anchorage

Question 33

Answer 33

Seaward limit of territorial sea

Question 34

Answer 34

Leading light

Question 35

Answer 35

Sector light

Question 36

Answer 36

Pilot boarding place Pilot boarding place with name Pilot boarding place with note Pilot transferred by helicopter