Exercises

1.The chart is drawn at 1:60 000. One centimetre on paper represents…

1. 60 m
2. 600 m
3. 6,000 m
4. 1 nautical mile

2.The position of the Mis Rocks isolated-danger buoy (Fl(2)W.10s, between Terminus Sound and Darell I.) is…

1. 50°05′.3N 005°13′.2W
2. 50°13′.2N 005°05′.3W
3. 50°05′.3N 005°31′.2W
4. 50°50′.3N 005°13′.2W

3.The compass rose reads “2°00′W 2026 (8′E)”. The variation to apply in 2029 is about…

1. 1°36′W
2. 2°24′W
3. 1°36′E
4. 2°00′W

4.Measure the distance from Helicon Head light to Darell Pt light.

Answer: __________ nm

5.Which border scale do you use to measure that distance?

1. The longitude scale (top or bottom)
2. The latitude scale (side), level with the leg
3. Either — they are the same
4. The bar scale in the title block only

6.The soundings printed across Seldon Deep are measured below…

1. Mean sea level
2. MLWS
3. Chart datum
4. The surface at the time of survey

7.Helicon Head is charted “Fl.WRG.6s24m10-6M”. The “24m” is…

1. The visible range in metres
2. The elevation of the light above the height datum
3. The height of the tower
4. The width of the white sector

8.In the same description, “10-6M” means…

1. Visible between 10 and 6 miles depending on weather
2. Ten flashes every 6 minutes
3. Nominal range 10 miles for the brightest sector, 6 for the dimmest
4. Lit from October to June

9.At night you time Kalgan Head light: three flashes together, then darkness, repeating every 15 seconds. That matches…

1. Fl(3)W.15s
2. Q(3)W.15s
3. Oc(3)W.15s
4. Iso.W.15s

10.Darell Pt is “Iso.WR.4s10m8/5M”. “Iso” tells you the light is…

1. Always on, never blinking
2. Equal periods of light and dark
3. Mostly dark with brief flashes
4. Mostly lit with brief eclipses

11.The Terminus leading lights (Oc.G.4s front, Oc.G.6s rear) are in line. You are inbound on the leading line — what course does the chart give you?

1. 189.5°T
2. 009.5°T
3. 095.0°T
4. Whatever keeps the buoys to port

12.“Oc” (occulting), as on those leading lights, means…

1. More dark than light
2. More light than dark — a lit light that winks off
3. A light shown only in fog
4. Off during daylight-saving time

13.The Ebling buoy (black over yellow, twin cones down, Q(6)+LFl.W.15s) guards Ebling Shoal. You pass…

1. North of it
2. South of it
3. East of it
4. Either side — it marks safe water

14.The Synnax buoy flashes Q(3)W.10s. It is…

1. A west cardinal — pass west
2. An east cardinal — pass east
3. A south cardinal — pass south
4. An isolated danger mark

15.At night, near Riose Bank, you count nine quick white flashes every 15 seconds. You should…

1. Pass north of the buoy
2. Pass east of the buoy
3. Pass west of the buoy
4. Anchor and wait for daylight

16.By day, the Terminus Fairway buoy (LFl.W.10s) looks like…

1. A yellow can with a ✕ topmark
2. Red and white vertical stripes with a single red sphere topmark
3. Black with a broad red band and two black spheres
4. A green cone

17.South of Kalgan Sound the chart shows a yellow buoy “ODAS” flashing Fl(5)Y.20s. It marks…

1. A wreck
2. The port-hand side of the channel
3. A data-gathering installation — a special mark, not a danger or channel edge
4. An anchorage

18.Entering Terminus Sound from seaward you meet T1 (Q.G). You leave it…

1. To port
2. To starboard
3. Either side
4. Astern — it marks the fairway centre

19.From the levels table, the mean SPRING range at Terminus is…

Answer: __________ m

20.To get high-water times for Streeling you…

1. Use the Terminus tables directly — same sound, same times
2. Apply Streeling’s secondary-port differences to the Terminus predictions
3. Add one hour in summer
4. Read them from the chart title block

21.A bank on Synnax Flats carries an underlined drying height of 1̲.8̲. What height of tide puts 2.0 m of water over it?

Answer: __________ m

22.In the levels table, “MLWS 0.7” means…

1. The lowest tide ever recorded was 0.7 m
2. Mean low water at springs sits 0.7 m above chart datum
3. Low water is always 0.7 m below chart datum
4. The chart datum is 0.7 m below the seabed

23.Today’s Terminus range is 2.6 m. Against the mean ranges (springs 4.7, neaps 2.5), today is…

1. Big springs
2. Near neaps
3. Exactly mid-range
4. Impossible to say

24.At HW−3 on a spring tide, diamond ◆C (Kalgan Sound entrance) runs…

1. 142° at 2.6 kn
2. 142° at 1.2 kn
3. 321° at 2.6 kn
4. 321° at 1.2 kn

25.Same row, but today is exactly mid-way between springs and neaps. The rate to use is about…

Answer: __________ kn

26.A set of 142° means the stream is flowing…

1. From 142° — like a wind direction
2. Towards 142° — streams are named for where they are going
3. Along the 142 m contour
4. At 1.42 knots

27.Diamond ◆A (Terminus Sound) sets ~112° before HW and ~293° after. Leaving Terminus to the WEST, your fair stream runs from…

1. HW−6 to HW
2. HW to HW+6
3. Springs only
4. There is never a fair stream

28.Four wrecks on the chart carry swept depths of 4̲.5̲, 6̲.3̲, 1̲1̲.8̲ and 1̲2̲. The shallowest water over any of them at chart datum is…

1. 4.5 m
2. 6.3 m
3. 11.8 m
4. 0 m — wrecks dry

29.Can a yacht drawing 2.0 m pass over that 4.5 m swept wreck at MLWS (0.7 m of tide)?

1. No — she would ground
2. Yes — about 3.2 m to spare under the keel
3. Only at high water
4. Only at neaps

30.Several rocks near Mis Rocks sit inside a dotted line. The dotted line tells you…

1. The area has been swept clear
2. A recommended anchorage
3. Keep outside — it fences off the whole danger area
4. A measured distance for speed trials

31.Arriving off Terminus from seaward at night, the best FIRST mark to identify is…

1. T1 (Q.G) deep inside the sound
2. The Terminus Fairway safe-water buoy, LFl.W.10s
3. Any green flash you can see
4. The ODAS buoy

32.Planning Terminus → Kalgan Sound (eastabout, past Synnax Flats), the factor that should set your departure time is…

1. Lunch
2. The streams at ◆A, ◆B and ◆C — carry the east-going tide, arrive as ◆C turns
3. Keeping the sun astern
4. The shop hours at Streeling