Worksheet 570 · Skill 5

Set and drift

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1. At 1550 your fix is 004°T, 2.6 nm from Westfield church spire. You steer 145°T at 7.7 kn through the water. At 1620 a new fix puts you 104°T, 1.8 nm from Westfield church spire.

   Plot the 1620 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 1305 your fix is 066°T, 1.8 nm from Heron Point Light. You steer 013°T at 6.6 kn through the water. At 1400 a new fix puts you 317°T, 2.7 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0700 your fix is 055°T, 2.4 nm from Tern Island tower. You steer 154°T at 4.0 kn through the water. At 0820 a new fix puts you 033°T, 1.4 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1320 your fix is 355°T, 3.4 nm from Mill stack. You steer 011°T at 6.2 kn through the water. At 1400 a new fix puts you 336°T, 2.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1130 your fix is 225°T, 1.1 nm from Gannet Rock daybeacon. You steer 014°T at 7.0 kn through the water. At 1205 a new fix puts you 054°T, 2.9 nm from Tern Island tower.

   Plot the 1205 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 1425 your fix is 031°T, 1.8 nm from Kittle water tank. You steer 351°T at 5.8 kn through the water. At 1455 a new fix puts you 041°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

7. At 1355 your fix is 261°T, 1.5 nm from Gannet Rock daybeacon. You steer 323°T at 8.2 kn through the water. At 1430 a new fix puts you 297°T, 4.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0705 your fix is 085°T, 2.6 nm from Tern Island tower. You steer 180°T at 7.5 kn through the water. At 0740 a new fix puts you 306°T, 1.4 nm from Kittle water tank.

   Plot the 0740 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