Worksheet 378 · Skill 5

Set and drift

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1. At 0720 your fix is 070°T, 1.0 nm from Heron Point Light. You steer 337°T at 8.4 kn through the water. At 0810 a new fix puts you 033°T, 3.5 nm from Westfield church spire.

   Plot the 0810 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0750 your fix is 084°T, 2.3 nm from Heron Point Light. You steer 315°T at 5.2 kn through the water. At 0825 a new fix puts you 330°T, 1.5 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1300 your fix is 328°T, 1.7 nm from Heron Point Light. You steer 082°T at 7.1 kn through the water. At 1400 a new fix puts you 223°T, 1.4 nm from Tern Island tower.

   Plot the 1400 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1305 your fix is 096°T, 3.2 nm from Westfield church spire. You steer 057°T at 4.8 kn through the water. At 1335 a new fix puts you 284°T, 2.7 nm from Tern Island tower.

   Plot the 1335 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  

5. At 1530 your fix is 315°T, 1.7 nm from Tern Island tower. You steer 213°T at 7.4 kn through the water. At 1615 a new fix puts you 019°T, 2.8 nm from Heron Point Light.

   Plot the 1615 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  

6. At 1440 your fix is 252°T, 3.4 nm from Tern Island tower. You steer 138°T at 6.8 kn through the water. At 1530 a new fix puts you 305°T, 1.3 nm from Kittle water tank.

   Plot the 1530 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0925 your fix is 005°T, 1.0 nm from Kittle water tank. You steer 343°T at 5.4 kn through the water. At 0955 a new fix puts you 022°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0955 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  

8. At 1155 your fix is 017°T, 1.2 nm from Tern Island tower. You steer 107°T at 7.3 kn through the water. At 1225 a new fix puts you 036°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1225 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