Worksheet 590 · Skill 5

Set and drift

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1. At 0820 your fix is 300°T, 4.5 nm from Tern Island tower. You steer 143°T at 4.4 kn through the water. At 0905 a new fix puts you 271°T, 1.5 nm from Tern Island tower.

   Plot the 0905 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 0935 your fix is 008°T, 1.8 nm from Kittle water tank. You steer 037°T at 4.3 kn through the water. At 1005 a new fix puts you 064°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1005 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  

3. At 1555 your fix is 179°T, 1.3 nm from Tern Island tower. You steer 080°T at 5.7 kn through the water. At 1630 a new fix puts you 020°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1630 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 1130 your fix is 071°T, 3.6 nm from Tern Island tower. You steer 278°T at 8.7 kn through the water. At 1210 a new fix puts you 308°T, 1.8 nm from Tern Island tower.

   Plot the 1210 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 1310 your fix is 041°T, 1.0 nm from Heron Point Light. You steer 035°T at 6.2 kn through the water. At 1345 a new fix puts you 265°T, 2.1 nm from Tern Island tower.

   Plot the 1345 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 0845 your fix is 046°T, 4.0 nm from Westfield church spire. You steer 094°T at 6.4 kn through the water. At 0940 a new fix puts you 074°T, 3.6 nm from Tern Island tower.

   Plot the 0940 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  

7. At 0910 your fix is 067°T, 3.6 nm from Tern Island tower. You steer 274°T at 6.6 kn through the water. At 0950 a new fix puts you 320°T, 2.7 nm from Tern Island tower.

   Plot the 0950 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  

8. At 1035 your fix is 351°T, 1.7 nm from Kittle water tank. You steer 291°T at 5.1 kn through the water. At 1110 a new fix puts you 271°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn