Worksheet 321 · Skill 5

Set and drift

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1. At 1240 your fix is 156°T, 1.8 nm from Westfield church spire. You steer 021°T at 7.6 kn through the water. At 1310 a new fix puts you 036°T, 2.9 nm from Westfield church spire.

   Plot the 1310 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 1245 your fix is 236°T, 2.0 nm from Tern Island tower. You steer 138°T at 6.3 kn through the water. At 1325 a new fix puts you 201°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1325 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  

3. At 1455 your fix is 236°T, 2.2 nm from Gannet Rock daybeacon. You steer 286°T at 6.8 kn through the water. At 1540 a new fix puts you 032°T, 2.1 nm from Heron Point Light.

   Plot the 1540 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  

4. At 0755 your fix is 020°T, 3.5 nm from Westfield church spire. You steer 152°T at 6.3 kn through the water. At 0845 a new fix puts you 106°T, 2.6 nm from Westfield church spire.

   Plot the 0845 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  

5. At 0905 your fix is 005°T, 3.4 nm from Westfield church spire. You steer 139°T at 6.0 kn through the water. At 1025 a new fix puts you 359°T, 3.4 nm from Mill stack.

   Plot the 1025 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  

6. At 0750 your fix is 012°T, 2.3 nm from Westfield church spire. You steer 073°T at 8.6 kn through the water. At 0820 a new fix puts you 311°T, 2.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1225 your fix is 050°T, 2.9 nm from Heron Point Light. You steer 034°T at 6.3 kn through the water. At 1300 a new fix puts you 317°T, 2.1 nm from Tern Island tower.

   Plot the 1300 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  

8. At 1445 your fix is 279°T, 2.4 nm from Tern Island tower. You steer 251°T at 6.0 kn through the water. At 1520 a new fix puts you 097°T, 2.3 nm from Westfield church spire.

   Plot the 1520 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