Worksheet 549 · Skill 5

Set and drift

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1. At 1415 your fix is 040°T, 2.2 nm from Kittle water tank. You steer 338°T at 8.9 kn through the water. At 1455 a new fix puts you 044°T, 2.8 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1540 your fix is 058°T, 3.5 nm from Westfield church spire. You steer 078°T at 4.4 kn through the water. At 1615 a new fix puts you 279°T, 1.9 nm from Tern Island tower.

   Plot the 1615 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 1040 your fix is 055°T, 3.2 nm from Tern Island tower. You steer 184°T at 4.9 kn through the water. At 1125 a new fix puts you 352°T, 1.1 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0810 your fix is 224°T, 2.2 nm from Gannet Rock daybeacon. You steer 103°T at 6.0 kn through the water. At 0845 a new fix puts you 147°T, 2.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1035 your fix is 116°T, 2.0 nm from Westfield church spire. You steer 104°T at 7.6 kn through the water. At 1125 a new fix puts you 241°T, 1.0 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1515 your fix is 015°T, 1.3 nm from Heron Point Light. You steer 065°T at 7.8 kn through the water. At 1550 a new fix puts you 253°T, 2.3 nm from Tern Island tower.

   Plot the 1550 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 1335 your fix is 009°T, 2.7 nm from Mill stack. You steer 264°T at 5.8 kn through the water. At 1405 a new fix puts you 021°T, 1.2 nm from Heron Point Light.

   Plot the 1405 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  

8. At 1045 your fix is 077°T, 3.4 nm from Westfield church spire. You steer 082°T at 4.5 kn through the water. At 1115 a new fix puts you 253°T, 2.7 nm from Tern Island tower.

   Plot the 1115 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