Worksheet 798 · Skill 5

Set and drift

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1. At 1030 your fix is 229°T, 2.2 nm from Gannet Rock daybeacon. You steer 301°T at 5.5 kn through the water. At 1135 a new fix puts you 337°T, 1.5 nm from Heron Point Light.

   Plot the 1135 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1245 your fix is 342°T, 1.3 nm from Kittle water tank. You steer 280°T at 8.1 kn through the water. At 1350 a new fix puts you 107°T, 2.3 nm from Westfield church spire.

   Plot the 1350 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1000 your fix is 063°T, 3.7 nm from Tern Island tower. You steer 271°T at 7.5 kn through the water. At 1055 a new fix puts you 044°T, 2.6 nm from Westfield church spire.

   Plot the 1055 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  

4. At 1315 your fix is 290°T, 3.7 nm from Tern Island tower. You steer 190°T at 6.5 kn through the water. At 1350 a new fix puts you 040°T, 2.4 nm from Heron Point Light.

   Plot the 1350 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  

5. At 1435 your fix is 299°T, 2.9 nm from Tern Island tower. You steer 164°T at 8.2 kn through the water. At 1515 a new fix puts you 001°T, 2.0 nm from Mill stack.

   Plot the 1515 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  

6. At 0950 your fix is 351°T, 1.8 nm from Heron Point Light. You steer 071°T at 5.2 kn through the water. At 1035 a new fix puts you 265°T, 2.5 nm from Gannet Rock daybeacon.

   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  

7. At 1240 your fix is 182°T, 1.6 nm from Gannet Rock daybeacon. You steer 288°T at 4.7 kn through the water. At 1315 a new fix puts you 262°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1315 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 1025 your fix is 314°T, 3.0 nm from Tern Island tower. You steer 192°T at 7.8 kn through the water. At 1105 a new fix puts you 345°T, 2.8 nm from Mill stack.

   Plot the 1105 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