Worksheet 802 · Skill 5

Set and drift

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1. At 0820 your fix is 036°T, 3.1 nm from Westfield church spire. You steer 152°T at 6.4 kn through the water. At 0900 a new fix puts you 048°T, 3.0 nm from Heron Point Light.

   Plot the 0900 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 1345 your fix is 073°T, 2.2 nm from Heron Point Light. You steer 103°T at 8.6 kn through the water. At 1415 a new fix puts you 211°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

3. At 1320 your fix is 063°T, 3.0 nm from Westfield church spire. You steer 105°T at 6.6 kn through the water. At 1350 a new fix puts you 253°T, 1.9 nm from Tern Island tower.

   Plot the 1350 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 1105 your fix is 098°T, 2.1 nm from Tern Island tower. You steer 142°T at 4.6 kn through the water. At 1150 a new fix puts you 040°T, 2.8 nm from Kittle water tank.

   Plot the 1150 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 1015 your fix is 245°T, 2.1 nm from Tern Island tower. You steer 214°T at 6.8 kn through the water. At 1045 a new fix puts you 042°T, 1.8 nm from Heron Point Light.

   Plot the 1045 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 0740 your fix is 037°T, 2.7 nm from Heron Point Light. You steer 152°T at 4.1 kn through the water. At 0820 a new fix puts you 359°T, 2.2 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 261°T, 2.5 nm from Tern Island tower. You steer 114°T at 7.1 kn through the water. At 1100 a new fix puts you 156°T, 2.7 nm from Tern Island tower.

   Plot the 1100 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 1335 your fix is 014°T, 1.4 nm from Kittle water tank. You steer 357°T at 4.3 kn through the water. At 1455 a new fix puts you 052°T, 2.4 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn