Worksheet 651 · Skill 5

Set and drift

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1. At 1120 your fix is 039°T, 4.0 nm from Westfield church spire. You steer 172°T at 6.1 kn through the water. At 1220 a new fix puts you 337°T, 1.8 nm from Mill stack.

   Plot the 1220 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  

2. At 0815 your fix is 211°T, 2.2 nm from Tern Island tower. You steer 275°T at 5.3 kn through the water. At 0915 a new fix puts you 175°T, 1.5 nm from Westfield church spire.

   Plot the 0915 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  

3. At 1525 your fix is 033°T, 2.0 nm from Mill stack. You steer 331°T at 5.6 kn through the water. At 1555 a new fix puts you 202°T, 2.9 nm from Tern Island tower.

   Plot the 1555 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  

4. At 1140 your fix is 008°T, 1.1 nm from Gannet Rock daybeacon. You steer 144°T at 4.6 kn through the water. At 1210 a new fix puts you 078°T, 1.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0905 your fix is 094°T, 3.3 nm from Westfield church spire. You steer 333°T at 6.4 kn through the water. At 0935 a new fix puts you 034°T, 2.8 nm from Westfield church spire.

   Plot the 0935 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  

6. At 1120 your fix is 277°T, 2.9 nm from Tern Island tower. You steer 192°T at 4.6 kn through the water. At 1155 a new fix puts you 093°T, 3.5 nm from Westfield church spire.

   Plot the 1155 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 0705 your fix is 012°T, 1.2 nm from Heron Point Light. You steer 058°T at 4.7 kn through the water. At 0750 a new fix puts you 263°T, 1.5 nm from Tern Island tower.

   Plot the 0750 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  

8. At 1225 your fix is 237°T, 3.4 nm from Tern Island tower. You steer 345°T at 5.1 kn through the water. At 1300 a new fix puts you 295°T, 2.5 nm from Tern Island tower.

   Plot the 1300 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