Worksheet 487 · Skill 5

Set and drift

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1. At 1050 your fix is 280°T, 3.0 nm from Tern Island tower. You steer 143°T at 7.1 kn through the water. At 1125 a new fix puts you 198°T, 2.3 nm from Tern Island tower.

   Plot the 1125 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  

2. At 1020 your fix is 069°T, 2.9 nm from Westfield church spire. You steer 085°T at 4.4 kn through the water. At 1105 a new fix puts you 300°T, 1.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1045 your fix is 105°T, 2.6 nm from Westfield church spire. You steer 097°T at 5.2 kn through the water. At 1155 a new fix puts you 014°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1155 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  

4. At 1105 your fix is 341°T, 2.8 nm from Mill stack. You steer 359°T at 4.2 kn through the water. At 1200 a new fix puts you 034°T, 3.6 nm from Heron Point Light.

   Plot the 1200 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 1305 your fix is 100°T, 2.9 nm from Westfield church spire. You steer 056°T at 4.2 kn through the water. At 1355 a new fix puts you 263°T, 3.2 nm from Tern Island tower.

   Plot the 1355 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 1405 your fix is 009°T, 3.4 nm from Westfield church spire. You steer 147°T at 5.9 kn through the water. At 1515 a new fix puts you 049°T, 2.3 nm from Heron Point Light.

   Plot the 1515 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  

7. At 1415 your fix is 135°T, 2.6 nm from Tern Island tower. You steer 262°T at 5.7 kn through the water. At 1515 a new fix puts you 071°T, 2.5 nm from Heron Point Light.

   Plot the 1515 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  

8. At 0900 your fix is 328°T, 1.6 nm from Heron Point Light. You steer 100°T at 6.1 kn through the water. At 0945 a new fix puts you 357°T, 1.4 nm from Mill stack.

   Plot the 0945 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