Worksheet 747 · Skill 5

Set and drift

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1. At 1540 your fix is 260°T, 2.5 nm from Tern Island tower. You steer 200°T at 5.7 kn through the water. At 1615 a new fix puts you 347°T, 2.3 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1130 your fix is 086°T, 1.2 nm from Westfield church spire. You steer 117°T at 4.8 kn through the water. At 1230 a new fix puts you 246°T, 3.2 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1510 your fix is 239°T, 1.6 nm from Gannet Rock daybeacon. You steer 265°T at 8.6 kn through the water. At 1545 a new fix puts you 013°T, 0.9 nm from Heron Point Light.

   Plot the 1545 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  

4. At 1115 your fix is 218°T, 1.2 nm from Gannet Rock daybeacon. You steer 287°T at 8.2 kn through the water. At 1155 a new fix puts you 089°T, 3.5 nm from Westfield church spire.

   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  

5. At 1525 your fix is 007°T, 1.4 nm from Heron Point Light. You steer 053°T at 8.2 kn through the water. At 1555 a new fix puts you 230°T, 1.9 nm from Tern Island tower.

   Plot the 1555 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 1015 your fix is 068°T, 1.9 nm from Heron Point Light. You steer 109°T at 4.6 kn through the water. At 1055 a new fix puts you 020°T, 2.6 nm from Mill stack.

   Plot the 1055 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 1310 your fix is 092°T, 3.5 nm from Westfield church spire. You steer 039°T at 8.4 kn through the water. At 1340 a new fix puts you 301°T, 2.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 059°T, 1.1 nm from Gannet Rock daybeacon. You steer 340°T at 6.9 kn through the water. At 1425 a new fix puts you 065°T, 2.0 nm from Tern Island tower.

   Plot the 1425 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