Worksheet 242 · Skill 5

Set and drift

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1. At 1040 your fix is 035°T, 2.7 nm from Westfield church spire. You steer 111°T at 7.9 kn through the water. At 1110 a new fix puts you 254°T, 2.3 nm from Tern Island tower.

   Plot the 1110 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0705 your fix is 292°T, 3.3 nm from Tern Island tower. You steer 163°T at 8.4 kn through the water. At 0745 a new fix puts you 044°T, 1.6 nm from Mill stack.

   Plot the 0745 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1020 your fix is 353°T, 3.1 nm from Mill stack. You steer 338°T at 4.7 kn through the water. At 1105 a new fix puts you 293°T, 3.6 nm from Tern Island tower.

   Plot the 1105 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1145 your fix is 124°T, 1.5 nm from Gannet Rock daybeacon. You steer 346°T at 6.0 kn through the water. At 1230 a new fix puts you 022°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1230 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1005 your fix is 212°T, 2.1 nm from Tern Island tower. You steer 123°T at 4.4 kn through the water. At 1035 a new fix puts you 204°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1035 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0710 your fix is 241°T, 2.2 nm from Gannet Rock daybeacon. You steer 283°T at 5.4 kn through the water. At 0755 a new fix puts you 240°T, 3.2 nm from Tern Island tower.

   Plot the 0755 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1425 your fix is 067°T, 3.1 nm from Tern Island tower. You steer 211°T at 5.0 kn through the water. At 1550 a new fix puts you 256°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1550 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0740 your fix is 068°T, 3.0 nm from Gannet Rock daybeacon. You steer 266°T at 6.1 kn through the water. At 0825 a new fix puts you 211°T, 2.4 nm from Tern Island tower.

   Plot the 0825 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn