Worksheet 26 · Skill 5

Set and drift

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1. At 0740 your fix is 296°T, 2.9 nm from Tern Island tower. You steer 083°T at 7.1 kn through the water. At 0825 a new fix puts you 074°T, 2.9 nm from Tern Island tower.

   Plot the 0825 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  

2. At 1455 your fix is 128°T, 0.8 nm from Gannet Rock daybeacon. You steer 014°T at 8.6 kn through the water. At 1530 a new fix puts you 069°T, 3.7 nm from Tern Island tower.

   Plot the 1530 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  

3. At 1220 your fix is 027°T, 3.0 nm from Heron Point Light. You steer 104°T at 7.1 kn through the water. At 1255 a new fix puts you 239°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1255 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 1445 your fix is 130°T, 1.4 nm from Westfield church spire. You steer 031°T at 4.3 kn through the water. At 1530 a new fix puts you 047°T, 3.4 nm from Westfield church spire.

   Plot the 1530 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 1500 your fix is 201°T, 2.1 nm from Gannet Rock daybeacon. You steer 040°T at 7.3 kn through the water. At 1540 a new fix puts you 047°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1540 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 1120 your fix is 013°T, 1.0 nm from Kittle water tank. You steer 276°T at 8.7 kn through the water. At 1200 a new fix puts you 010°T, 2.3 nm from Mill stack.

   Plot the 1200 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  

7. At 1450 your fix is 039°T, 3.1 nm from Tern Island tower. You steer 156°T at 4.7 kn through the water. At 1525 a new fix puts you 075°T, 3.4 nm from Tern Island tower.

   Plot the 1525 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 0830 your fix is 069°T, 2.4 nm from Tern Island tower. You steer 176°T at 4.8 kn through the water. At 0920 a new fix puts you 147°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0920 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