Worksheet 333 · Skill 5

Set and drift

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1. At 0720 your fix is 053°T, 2.0 nm from Heron Point Light. You steer 102°T at 8.9 kn through the water. At 0750 a new fix puts you 036°T, 2.4 nm from Mill stack.

   Plot the 0750 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 1145 your fix is 037°T, 4.1 nm from Gannet Rock daybeacon. You steer 199°T at 4.6 kn through the water. At 1235 a new fix puts you 153°T, 2.6 nm from Tern Island tower.

   Plot the 1235 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  

3. At 1125 your fix is 052°T, 4.1 nm from Westfield church spire. You steer 149°T at 5.5 kn through the water. At 1250 a new fix puts you 186°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1250 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 1315 your fix is 142°T, 2.3 nm from Tern Island tower. You steer 262°T at 6.5 kn through the water. At 1350 a new fix puts you 230°T, 3.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0920 your fix is 046°T, 2.9 nm from Westfield church spire. You steer 202°T at 5.0 kn through the water. At 0955 a new fix puts you 136°T, 1.6 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1320 your fix is 029°T, 2.2 nm from Mill stack. You steer 297°T at 4.4 kn through the water. At 1440 a new fix puts you 069°T, 3.6 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0830 your fix is 078°T, 2.2 nm from Heron Point Light. You steer 334°T at 4.6 kn through the water. At 0920 a new fix puts you 048°T, 1.9 nm from Westfield church spire.

   Plot the 0920 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  

8. At 1555 your fix is 030°T, 2.2 nm from Heron Point Light. You steer 082°T at 7.6 kn through the water. At 1705 a new fix puts you 124°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1705 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