Worksheet 134 · Skill 5

Set and drift

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1. At 1415 your fix is 319°T, 2.8 nm from Tern Island tower. You steer 227°T at 4.1 kn through the water. At 1525 a new fix puts you 026°T, 3.2 nm from Heron Point Light.

   Plot the 1525 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  

2. At 1025 your fix is 253°T, 2.7 nm from Tern Island tower. You steer 139°T at 8.6 kn through the water. At 1105 a new fix puts you 302°T, 1.9 nm from Kittle water tank.

   Plot the 1105 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 1435 your fix is 023°T, 1.7 nm from Kittle water tank. You steer 336°T at 8.2 kn through the water. At 1505 a new fix puts you 088°T, 1.9 nm from Tern Island tower.

   Plot the 1505 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 0825 your fix is 261°T, 3.2 nm from Gannet Rock daybeacon. You steer 313°T at 4.2 kn through the water. At 0905 a new fix puts you 258°T, 2.7 nm from Tern Island tower.

   Plot the 0905 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 1430 your fix is 328°T, 2.8 nm from Kittle water tank. You steer 305°T at 5.0 kn through the water. At 1530 a new fix puts you 052°T, 4.0 nm from Westfield church spire.

   Plot the 1530 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  

6. At 1525 your fix is 358°T, 0.9 nm from Heron Point Light. You steer 031°T at 4.8 kn through the water. At 1600 a new fix puts you 079°T, 2.8 nm from Westfield church spire.

   Plot the 1600 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  

7. At 1215 your fix is 000°T, 2.3 nm from Mill stack. You steer 328°T at 4.6 kn through the water. At 1250 a new fix puts you 090°T, 2.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0915 your fix is 203°T, 1.3 nm from Tern Island tower. You steer 226°T at 6.1 kn through the water. At 0955 a new fix puts you 071°T, 2.4 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn