Worksheet 576 · Skill 5

Set and drift

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1. At 1040 your fix is 253°T, 1.1 nm from Gannet Rock daybeacon. You steer 295°T at 8.1 kn through the water. At 1110 a new fix puts you 242°T, 2.5 nm from Tern Island tower.

   Plot the 1110 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 0750 your fix is 060°T, 1.9 nm from Heron Point Light. You steer 341°T at 8.4 kn through the water. At 0830 a new fix puts you 031°T, 3.7 nm from Westfield church spire.

   Plot the 0830 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  

3. At 1455 your fix is 043°T, 3.8 nm from Gannet Rock daybeacon. You steer 286°T at 4.9 kn through the water. At 1535 a new fix puts you 003°T, 1.4 nm from Tern Island tower.

   Plot the 1535 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  

4. At 1115 your fix is 238°T, 2.0 nm from Tern Island tower. You steer 312°T at 6.5 kn through the water. At 1150 a new fix puts you 046°T, 2.7 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1400 your fix is 007°T, 1.9 nm from Mill stack. You steer 059°T at 4.7 kn through the water. At 1435 a new fix puts you 259°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1435 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  

6. At 1040 your fix is 266°T, 3.5 nm from Tern Island tower. You steer 105°T at 5.5 kn through the water. At 1115 a new fix puts you 210°T, 1.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1515 your fix is 334°T, 1.4 nm from Gannet Rock daybeacon. You steer 207°T at 7.2 kn through the water. At 1545 a new fix puts you 053°T, 2.3 nm from Mill stack.

   Plot the 1545 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 1320 your fix is 083°T, 3.7 nm from Westfield church spire. You steer 128°T at 5.2 kn through the water. At 1430 a new fix puts you 223°T, 1.8 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn