Worksheet 551 · Skill 5

Set and drift

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1. At 1535 your fix is 058°T, 1.4 nm from Heron Point Light. You steer 100°T at 5.8 kn through the water. At 1605 a new fix puts you 011°T, 2.5 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 035°T, 4.2 nm from Gannet Rock daybeacon. You steer 207°T at 6.2 kn through the water. At 0820 a new fix puts you 282°T, 2.2 nm from Kittle water tank.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0950 your fix is 264°T, 2.7 nm from Tern Island tower. You steer 045°T at 6.4 kn through the water. At 1025 a new fix puts you 016°T, 2.4 nm from Tern Island tower.

   Plot the 1025 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  

4. At 1215 your fix is 037°T, 2.9 nm from Tern Island tower. You steer 121°T at 7.5 kn through the water. At 1245 a new fix puts you 041°T, 4.5 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1255 your fix is 034°T, 3.6 nm from Gannet Rock daybeacon. You steer 224°T at 9.0 kn through the water. At 1335 a new fix puts you 003°T, 1.4 nm from Mill stack.

   Plot the 1335 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  

6. At 0925 your fix is 301°T, 1.1 nm from Gannet Rock daybeacon. You steer 078°T at 4.1 kn through the water. At 1015 a new fix puts you 035°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1015 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  

7. At 1110 your fix is 063°T, 4.1 nm from Tern Island tower. You steer 279°T at 7.8 kn through the water. At 1140 a new fix puts you 328°T, 2.7 nm from Tern Island tower.

   Plot the 1140 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 1520 your fix is 031°T, 1.7 nm from Gannet Rock daybeacon. You steer 265°T at 5.0 kn through the water. At 1640 a new fix puts you 062°T, 2.5 nm from Heron Point Light.

   Plot the 1640 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