Worksheet 65 · Skill 5

Set and drift

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1. At 0820 your fix is 034°T, 2.3 nm from Westfield church spire. You steer 077°T at 4.1 kn through the water. At 0915 a new fix puts you 284°T, 1.9 nm from Tern Island tower.

   Plot the 0915 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  

2. At 1030 your fix is 063°T, 2.3 nm from Westfield church spire. You steer 065°T at 7.3 kn through the water. At 1105 a new fix puts you 334°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1400 your fix is 234°T, 2.2 nm from Tern Island tower. You steer 122°T at 7.0 kn through the water. At 1455 a new fix puts you 165°T, 1.7 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1520 your fix is 252°T, 2.9 nm from Tern Island tower. You steer 040°T at 4.9 kn through the water. At 1605 a new fix puts you 348°T, 1.4 nm from Tern Island tower.

   Plot the 1605 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  

5. At 1125 your fix is 257°T, 2.2 nm from Tern Island tower. You steer 212°T at 7.0 kn through the water. At 1155 a new fix puts you 030°T, 1.7 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1255 your fix is 037°T, 3.4 nm from Gannet Rock daybeacon. You steer 243°T at 6.4 kn through the water. At 1330 a new fix puts you 176°T, 1.7 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1150 your fix is 045°T, 2.5 nm from Gannet Rock daybeacon. You steer 241°T at 6.0 kn through the water. At 1245 a new fix puts you 214°T, 2.6 nm from Tern Island tower.

   Plot the 1245 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  

8. At 1200 your fix is 042°T, 2.4 nm from Westfield church spire. You steer 171°T at 4.8 kn through the water. At 1235 a new fix puts you 103°T, 1.8 nm from Westfield church spire.

   Plot the 1235 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