Current Sailing LAB

1
Current Sailing LAB
11/15/2009
2
TR
SOA
C
S
D
S
Estimated Current Triangle
3
C
S
S
D
COG
SOG
Actual Current Triangle
4
Actual Current Direction
0700 Fix Position
0730 DR Position
Course Speed Vector
C - 090 S - 12
Set Drift Vector Set 220 T Drift 2
kts Distance 1 NM
COG SOG Vector
0730 Fix Position
Computing Set Drift
5
Sanity Check
Upon determining course and speed required, you
should check your plot by remembering these
points When compensating for set and drift,
all corrections must be opposite of the current
effect. 1. Current pushing ahead, decrease
speed. 2. Current pushing astern, increase
speed. 3. Current pushing left, steer more to
the right. 4. Current pushing right, steer
more to the left.
6
Lab
At time 1300 Following fix is taken A-028 B-
250 C-098 You are on Course 045 T, 10 kts
7
LAB
At 1312, you take following fix A- 017 B-240
C-111 What is the current Set Drift?
8
LAB

• What is the course and speed required to get back
  on track at 1324?

9
LAB

• What do you expect A, B, and C to bear at 1324?

10
LAB

• At 1324,
• A 358 B 232 C 138

11
LAB

• You turn to course 180, speed 10 kts _at_1324.
• What is your estimated position at 1336?

12
LAB

• Fix time 1336
• A 005 B 258 C 107
• What is new set and drift?

13
LAB

• What is course and speed required to return to
  first position(1300 fix) at time 1348?