Worksheet 794 · Skill 5

Set and drift

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1. At 0935 your fix is 040°T, 1.2 nm from Heron Point Light. You steer 341°T at 6.9 kn through the water. At 1015 a new fix puts you 026°T, 2.4 nm from Westfield church spire.

   Plot the 1015 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 0805 your fix is 301°T, 3.7 nm from Tern Island tower. You steer 141°T at 8.5 kn through the water. At 0845 a new fix puts you 252°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0845 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  

3. At 1120 your fix is 337°T, 2.2 nm from Mill stack. You steer 037°T at 6.2 kn through the water. At 1155 a new fix puts you 295°T, 1.5 nm from Gannet Rock daybeacon.

   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  

4. At 1315 your fix is 205°T, 2.3 nm from Tern Island tower. You steer 074°T at 7.7 kn through the water. At 1355 a new fix puts you 058°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1355 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 1335 your fix is 045°T, 2.1 nm from Kittle water tank. You steer 341°T at 5.6 kn through the water. At 1435 a new fix puts you 049°T, 3.6 nm from Tern Island tower.

   Plot the 1435 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  

6. At 1140 your fix is 316°T, 1.5 nm from Kittle water tank. You steer 264°T at 8.2 kn through the water. At 1215 a new fix puts you 347°T, 1.0 nm from Mill stack.

   Plot the 1215 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 0805 your fix is 089°T, 3.6 nm from Westfield church spire. You steer 007°T at 4.3 kn through the water. At 0845 a new fix puts you 297°T, 4.2 nm from Tern Island tower.

   Plot the 0845 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 0935 your fix is 285°T, 3.5 nm from Tern Island tower. You steer 085°T at 7.1 kn through the water. At 1030 a new fix puts you 057°T, 3.1 nm from Tern Island tower.

   Plot the 1030 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