Worksheet 565 · Skill 5

Set and drift

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1. At 1400 your fix is 093°T, 3.3 nm from Westfield church spire. You steer 289°T at 4.4 kn through the water. At 1440 a new fix puts you 072°T, 1.1 nm from Westfield church spire.

   Plot the 1440 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  

2. At 0750 your fix is 079°T, 2.3 nm from Heron Point Light. You steer 346°T at 4.4 kn through the water. At 0915 a new fix puts you 263°T, 2.3 nm from Tern Island tower.

   Plot the 0915 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  

3. At 1215 your fix is 041°T, 3.0 nm from Heron Point Light. You steer 076°T at 5.3 kn through the water. At 1340 a new fix puts you 137°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1340 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  

4. At 0735 your fix is 015°T, 0.8 nm from Kittle water tank. You steer 291°T at 7.9 kn through the water. At 0810 a new fix puts you 186°T, 1.8 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0935 your fix is 055°T, 3.4 nm from Tern Island tower. You steer 210°T at 7.2 kn through the water. At 1030 a new fix puts you 066°T, 2.5 nm from Mill stack.

   Plot the 1030 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1535 your fix is 075°T, 2.3 nm from Heron Point Light. You steer 093°T at 4.0 kn through the water. At 1640 a new fix puts you 035°T, 2.5 nm from Mill stack.

   Plot the 1640 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1040 your fix is 298°T, 2.0 nm from Tern Island tower. You steer 205°T at 4.4 kn through the water. At 1150 a new fix puts you 068°T, 2.2 nm from Heron Point Light.

   Plot the 1150 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1325 your fix is 308°T, 3.6 nm from Tern Island tower. You steer 226°T at 4.1 kn through the water. At 1355 a new fix puts you 067°T, 3.4 nm from Westfield church spire.

   Plot the 1355 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