Worksheet 623 · Skill 5

Set and drift

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1. At 1300 your fix is 230°T, 3.0 nm from Tern Island tower. You steer 144°T at 5.6 kn through the water. At 1330 a new fix puts you 007°T, 2.0 nm from Mill stack.

   Plot the 1330 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 1340 your fix is 028°T, 3.4 nm from Heron Point Light. You steer 009°T at 4.1 kn through the water. At 1425 a new fix puts you 289°T, 3.9 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1210 your fix is 279°T, 2.7 nm from Tern Island tower. You steer 271°T at 7.7 kn through the water. At 1240 a new fix puts you 017°T, 2.5 nm from Westfield church spire.

   Plot the 1240 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  

4. At 0710 your fix is 051°T, 2.5 nm from Mill stack. You steer 300°T at 6.2 kn through the water. At 0820 a new fix puts you 027°T, 2.3 nm from Westfield church spire.

   Plot the 0820 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  

5. At 0920 your fix is 237°T, 2.8 nm from Tern Island tower. You steer 283°T at 4.1 kn through the water. At 1010 a new fix puts you 050°T, 3.1 nm from Westfield church spire.

   Plot the 1010 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  

6. At 1035 your fix is 098°T, 1.9 nm from Tern Island tower. You steer 336°T at 4.2 kn through the water. At 1115 a new fix puts you 028°T, 1.9 nm from Tern Island tower.

   Plot the 1115 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 0935 your fix is 052°T, 2.3 nm from Tern Island tower. You steer 173°T at 4.4 kn through the water. At 1050 a new fix puts you 090°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1050 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1410 your fix is 087°T, 3.6 nm from Westfield church spire. You steer 192°T at 4.5 kn through the water. At 1455 a new fix puts you 083°T, 1.5 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn