Worksheet 47 · Skill 5

Set and drift

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1. At 1130 your fix is 213°T, 3.3 nm from Tern Island tower. You steer 069°T at 4.6 kn through the water. At 1200 a new fix puts you 277°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1200 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  

2. At 0705 your fix is 251°T, 1.0 nm from Gannet Rock daybeacon. You steer 274°T at 6.8 kn through the water. At 0800 a new fix puts you 082°T, 3.4 nm from Westfield church spire.

   Plot the 0800 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  

3. At 0950 your fix is 008°T, 1.5 nm from Heron Point Light. You steer 034°T at 4.1 kn through the water. At 1040 a new fix puts you 086°T, 3.1 nm from Westfield church spire.

   Plot the 1040 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1445 your fix is 329°T, 2.2 nm from Tern Island tower. You steer 273°T at 5.1 kn through the water. At 1545 a new fix puts you 046°T, 3.1 nm from Westfield church spire.

   Plot the 1545 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  

5. At 0705 your fix is 355°T, 1.2 nm from Kittle water tank. You steer 017°T at 6.7 kn through the water. At 0750 a new fix puts you 042°T, 4.4 nm from Gannet Rock daybeacon.

   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  

6. At 1225 your fix is 148°T, 1.3 nm from Westfield church spire. You steer 093°T at 4.5 kn through the water. At 1355 a new fix puts you 229°T, 2.1 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0915 your fix is 213°T, 3.1 nm from Tern Island tower. You steer 251°T at 7.3 kn through the water. At 0945 a new fix puts you 024°T, 1.1 nm from Heron Point Light.

   Plot the 0945 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  

8. At 0740 your fix is 064°T, 1.0 nm from Westfield church spire. You steer 106°T at 5.0 kn through the water. At 0905 a new fix puts you 202°T, 1.8 nm from Gannet Rock daybeacon.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn