Page 13
Copyright
W
ORKSHEET
7: P
LOTTING
A
SET OF WAYPOINTS
Proposed voyage
Day 1: We have provision our vessel at Maryport Bay on Carlisle
Island and plan research scientific shoal on day 1, anchoring at
Goldsmith Island that night.
Day 2: Study the bird colony on Tinsmith Island and then return to
the anchorage
Days 3 and 4: Estimate fish population at Geranium Shoal and try
to tag fish Day 5
Return to anchorage at Maryport Bay
Set a course for these places
Q1. Mark the following waypoints on your chart
WP 01 20
o
47.2' S 149
o
15. 9' E
WP 02 20
o
45.5' S 149
o
09. 0' E
WP 03 20
o
43.8' S 149
o
08. 2' E
WP 04 20
o
42.1' S 149
o
09. 2' E
WP 05 20
o
42.4' S 149
o
13. 0' E
WP 06 20
o
38.9' S 149
o
13. 6' E
Q2. Join the lines of position to join and complete the table below using the deviations given and derived from the table
above.
Course
True
Variation Magnetic
Deviation Compass course
From To
T
V
M
D
C
WP1
WP2
5
o
W
WP2
WP3
0
o
W
WP3
WP4
4.5
o
W
WP4
WP5
5
o
W
WP5
WP6
3.5
o
W
WP6
WP01
.5
o
W
Sometimes its easier to use the total error
Q3. List potential chart hazards for the trip in the table below
From To
Potential hazards
WP1 WP2
WP2 WP3
WP3 WP4
WP4 WP5
WP5 WP6
WP6 WP01
Q4. Calculate potential times for each leg of the trip, if the ship makes 6 knots.
Figure 13.1 Ship's deviation table
From To
WP4 WP5
WP5 WP6
WP6 WP01
From To
WP1 WP2
WP2 WP3
WP3 WP4
