Worksheet 621 · Skill 5

Set and drift

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1. At 1455 your fix is 014°T, 2.9 nm from Westfield church spire. You steer 152°T at 6.4 kn through the water. At 1610 a new fix puts you 261°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1610 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0825 your fix is 054°T, 2.4 nm from Tern Island tower. You steer 159°T at 7.4 kn through the water. At 0910 a new fix puts you 046°T, 1.9 nm from Kittle water tank.

   Plot the 0910 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  

3. At 0950 your fix is 036°T, 1.5 nm from Heron Point Light. You steer 053°T at 4.6 kn through the water. At 1035 a new fix puts you 229°T, 2.5 nm from Tern Island tower.

   Plot the 1035 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  

4. At 0910 your fix is 065°T, 3.0 nm from Heron Point Light. You steer 351°T at 8.1 kn through the water. At 0940 a new fix puts you 271°T, 3.0 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0950 your fix is 004°T, 2.7 nm from Mill stack. You steer 313°T at 7.2 kn through the water. At 1050 a new fix puts you 012°T, 1.9 nm from Westfield church spire.

   Plot the 1050 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 1600 your fix is 040°T, 3.9 nm from Westfield church spire. You steer 190°T at 6.4 kn through the water. At 1645 a new fix puts you 336°T, 1.2 nm from Heron Point Light.

   Plot the 1645 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  

7. At 1325 your fix is 349°T, 1.1 nm from Kittle water tank. You steer 359°T at 7.8 kn through the water. At 1410 a new fix puts you 077°T, 3.0 nm from Tern Island tower.

   Plot the 1410 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 0830 your fix is 251°T, 2.1 nm from Gannet Rock daybeacon. You steer 326°T at 5.2 kn through the water. At 0915 a new fix puts you 271°T, 3.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn