Worksheet 281 · Skill 5

Set and drift

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1. At 1225 your fix is 285°T, 1.4 nm from Tern Island tower. You steer 182°T at 4.3 kn through the water. At 1305 a new fix puts you 241°T, 1.9 nm from Tern Island tower.

   Plot the 1305 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 0735 your fix is 024°T, 1.8 nm from Westfield church spire. You steer 127°T at 6.3 kn through the water. At 0840 a new fix puts you 240°T, 3.4 nm from Tern Island tower.

   Plot the 0840 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  

3. At 1315 your fix is 213°T, 2.8 nm from Tern Island tower. You steer 122°T at 4.0 kn through the water. At 1405 a new fix puts you 153°T, 3.1 nm from Tern Island tower.

   Plot the 1405 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  

4. At 0730 your fix is 015°T, 2.1 nm from Mill stack. You steer 306°T at 6.3 kn through the water. At 0805 a new fix puts you 020°T, 2.3 nm from Heron Point Light.

   Plot the 0805 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 1310 your fix is 345°T, 3.0 nm from Mill stack. You steer 285°T at 4.1 kn through the water. At 1350 a new fix puts you 092°T, 2.7 nm from Westfield church spire.

   Plot the 1350 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  

6. At 1115 your fix is 174°T, 1.3 nm from Tern Island tower. You steer 235°T at 7.4 kn through the water. At 1155 a new fix puts you 087°T, 2.0 nm from Heron Point Light.

   Plot the 1155 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  

7. At 1425 your fix is 092°T, 1.4 nm from Heron Point Light. You steer 035°T at 8.7 kn through the water. At 1455 a new fix puts you 263°T, 2.4 nm from Tern Island tower.

   Plot the 1455 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 0715 your fix is 258°T, 1.9 nm from Tern Island tower. You steer 287°T at 4.5 kn through the water. At 0755 a new fix puts you 064°T, 3.4 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn