Worksheet 612 · Skill 5

Set and drift

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1. At 0850 your fix is 355°T, 2.9 nm from Mill stack. You steer 341°T at 7.3 kn through the water. At 0930 a new fix puts you 314°T, 3.1 nm from Tern Island tower.

   Plot the 0930 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 1025 your fix is 015°T, 2.0 nm from Gannet Rock daybeacon. You steer 164°T at 4.9 kn through the water. At 1110 a new fix puts you 355°T, 1.7 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0805 your fix is 052°T, 3.9 nm from Westfield church spire. You steer 170°T at 8.3 kn through the water. At 0840 a new fix puts you 093°T, 1.5 nm from Heron Point Light.

   Plot the 0840 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 1540 your fix is 270°T, 3.6 nm from Tern Island tower. You steer 119°T at 4.2 kn through the water. At 1625 a new fix puts you 215°T, 2.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0910 your fix is 095°T, 2.5 nm from Gannet Rock daybeacon. You steer 264°T at 5.7 kn through the water. At 0945 a new fix puts you 240°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0945 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 1205 your fix is 007°T, 2.2 nm from Heron Point Light. You steer 345°T at 5.8 kn through the water. At 1240 a new fix puts you 024°T, 2.5 nm from Westfield church spire.

   Plot the 1240 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 1320 your fix is 070°T, 1.3 nm from Heron Point Light. You steer 358°T at 6.1 kn through the water. At 1410 a new fix puts you 064°T, 2.8 nm from Westfield church spire.

   Plot the 1410 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  

8. At 0925 your fix is 339°T, 1.6 nm from Kittle water tank. You steer 354°T at 6.0 kn through the water. At 1000 a new fix puts you 081°T, 3.2 nm from Tern Island tower.

   Plot the 1000 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