Page 12
Copyright
W
ORKSHEET
5: L
OCATING
A
RESEARCH
SITE
Questions
Q1. List some of the features that need to be considered when selecting a offshore research site (Page 35).
Q2. Locate the following possible research sites latitude and longitude on the A3 version of Research Bay Chart: Hempel
Rock, Coppersmith Rock Lighthouse and Hill 670 Cockermouth Island and Devereux Rk. (Download A3 Chart from
- Resources section)
a) Hempel Rock
b) Coppersmith Rock Lighthouse
c) Hill 670 Cockermouth Island
d) Devereux Rk
Q3. Calculate distance speed and time for the following information for a research boat. (Page 37)
a. How far can the boat travel in 10 hours if she is travelling at 9 knots?
b.How far can the boat travel in 6 hours at a constant speed of 4 knots?
c. For 2 hours she travels at 10 knots, and for the next 3 hours she can only make 5 knots. How far has she travelled?
d.The boat travels 10 Nm in two hours. How fast did she go?
e. The boat left harbour at 7 a.m. and travelled 5Nmto a research site arriving at 10 a.m. Howwell did the boat perform?
f. How long did it take a skipper of a vessel to travel 20 Nm at an average speed of 5 knots?
g. Your research boat is travelling at 4 knots and your navigator predicts 32 Nm to go. How many hours will it take
to reach your destination?
Q3. Define the term chart tidal datum (Page 35)
Tide tables for Brampton Is
Date Time m
Jan 1 0221 0.99
0815 2.32
1424 0.51
2101 2.55
Jan 2 0252 1.06
0835 2.22
1452 0.49
2133 2.58
Jan 3 0321 1.16
0900 2.06
1524 0.51
2201 2.55
Date Time m
Jan 4 0409 1.26
0930 1.93
1559 0.54
2252 2.66
Jan 5 0502 1.99
1007 3.32
1642 0.71
2301 3.55
Q4. Calculate the distance and departure time from the
Anchorage at Maryport Bay off Carlisle Island to a
position north east of Geranium Shoal Lat: 20
o
44' S,
Long: 149
o
16.00' E using the following information.
Research vessel can do 6 knots and draws 1.9 m and
is grounded on the 0.4 m mark at Brampton Island.
Estimate the ETD for the morning of 4 January and
how longwill it take to get to Lat: 20
o
44' S, Long: 149
o
16.00' E? Use the tide tables in Figure 12.1 .
Figure 12.1 Tide tables for Brampton Is
