Worksheet 446 · Skill 5

Set and drift

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1. At 1400 your fix is 065°T, 2.3 nm from Heron Point Light. You steer 081°T at 5.5 kn through the water. At 1430 a new fix puts you 208°T, 2.9 nm from Tern Island tower.

   Plot the 1430 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  

2. At 1030 your fix is 348°T, 1.3 nm from Tern Island tower. You steer 259°T at 7.5 kn through the water. At 1120 a new fix puts you 099°T, 1.7 nm from Westfield church spire.

   Plot the 1120 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  

3. At 1020 your fix is 062°T, 5.1 nm from Tern Island tower. You steer 180°T at 5.2 kn through the water. At 1120 a new fix puts you 067°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1120 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  

4. At 0900 your fix is 054°T, 1.7 nm from Heron Point Light. You steer 084°T at 5.4 kn through the water. At 0935 a new fix puts you 256°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0935 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 1345 your fix is 037°T, 1.5 nm from Heron Point Light. You steer 145°T at 4.6 kn through the water. At 1415 a new fix puts you 323°T, 1.7 nm from Mill stack.

   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  

6. At 1050 your fix is 142°T, 1.4 nm from Westfield church spire. You steer 046°T at 6.5 kn through the water. At 1145 a new fix puts you 303°T, 3.2 nm from Tern Island tower.

   Plot the 1145 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  

7. At 0905 your fix is 021°T, 0.8 nm from Heron Point Light. You steer 351°T at 4.8 kn through the water. At 1005 a new fix puts you 052°T, 2.6 nm from Westfield church spire.

   Plot the 1005 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 1105 your fix is 336°T, 2.4 nm from Mill stack. You steer 077°T at 6.3 kn through the water. At 1155 a new fix puts you 301°T, 1.6 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn