Worksheet 532 · Skill 5

Set and drift

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1. At 0800 your fix is 119°T, 1.2 nm from Gannet Rock daybeacon. You steer 230°T at 6.6 kn through the water. At 0830 a new fix puts you 053°T, 2.3 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 042°T, 2.5 nm from Tern Island tower. You steer 264°T at 5.0 kn through the water. At 0805 a new fix puts you 301°T, 2.9 nm from Tern Island tower.

   Plot the 0805 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  

3. At 1515 your fix is 022°T, 1.5 nm from Heron Point Light. You steer 046°T at 5.7 kn through the water. At 1625 a new fix puts you 300°T, 2.9 nm from Tern Island tower.

   Plot the 1625 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  

4. At 1405 your fix is 002°T, 1.7 nm from Heron Point Light. You steer 064°T at 4.7 kn through the water. At 1445 a new fix puts you 208°T, 1.9 nm from Tern Island tower.

   Plot the 1445 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  

5. At 0810 your fix is 047°T, 1.2 nm from Kittle water tank. You steer 343°T at 6.9 kn through the water. At 0900 a new fix puts you 047°T, 2.6 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1300 your fix is 057°T, 1.1 nm from Heron Point Light. You steer 064°T at 5.3 kn through the water. At 1400 a new fix puts you 211°T, 3.1 nm from Tern Island tower.

   Plot the 1400 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  

7. At 1245 your fix is 060°T, 1.7 nm from Kittle water tank. You steer 281°T at 5.4 kn through the water. At 1320 a new fix puts you 300°T, 1.8 nm from Kittle water tank.

   Plot the 1320 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 1420 your fix is 244°T, 1.0 nm from Gannet Rock daybeacon. You steer 280°T at 9.0 kn through the water. At 1450 a new fix puts you 039°T, 2.5 nm from Heron Point Light.

   Plot the 1450 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