Worksheet 867 · Skill 5

Set and drift

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1. At 0715 your fix is 313°T, 3.5 nm from Tern Island tower. You steer 097°T at 4.3 kn through the water. At 0820 a new fix puts you 062°T, 2.1 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1150 your fix is 037°T, 3.3 nm from Westfield church spire. You steer 190°T at 8.5 kn through the water. At 1225 a new fix puts you 010°T, 1.9 nm from Heron Point Light.

   Plot the 1225 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  

3. At 1000 your fix is 238°T, 1.9 nm from Tern Island tower. You steer 310°T at 7.3 kn through the water. At 1030 a new fix puts you 040°T, 4.0 nm from Westfield church spire.

   Plot the 1030 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 1500 your fix is 287°T, 1.2 nm from Gannet Rock daybeacon. You steer 227°T at 5.0 kn through the water. At 1555 a new fix puts you 004°T, 1.8 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1130 your fix is 032°T, 1.3 nm from Tern Island tower. You steer 106°T at 4.5 kn through the water. At 1225 a new fix puts you 056°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1225 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1355 your fix is 019°T, 1.7 nm from Westfield church spire. You steer 138°T at 7.6 kn through the water. At 1450 a new fix puts you 347°T, 2.2 nm from Mill stack.

   Plot the 1450 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1315 your fix is 037°T, 3.7 nm from Westfield church spire. You steer 134°T at 4.6 kn through the water. At 1425 a new fix puts you 034°T, 3.3 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1235 your fix is 026°T, 2.8 nm from Heron Point Light. You steer 123°T at 6.0 kn through the water. At 1315 a new fix puts you 018°T, 2.1 nm from Mill stack.

   Plot the 1315 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