Worksheet 104 · Skill 5

Set and drift

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1. At 1220 your fix is 012°T, 2.1 nm from Mill stack. You steer 308°T at 4.9 kn through the water. At 1335 a new fix puts you 060°T, 3.7 nm from Westfield church spire.

   Plot the 1335 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 0900 your fix is 221°T, 2.4 nm from Gannet Rock daybeacon. You steer 309°T at 4.4 kn through the water. At 1015 a new fix puts you 248°T, 3.2 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0930 your fix is 164°T, 1.3 nm from Gannet Rock daybeacon. You steer 270°T at 5.4 kn through the water. At 1030 a new fix puts you 208°T, 3.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1200 your fix is 239°T, 2.0 nm from Gannet Rock daybeacon. You steer 092°T at 4.3 kn through the water. At 1235 a new fix puts you 160°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1235 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 0925 your fix is 272°T, 2.5 nm from Tern Island tower. You steer 200°T at 4.0 kn through the water. At 1005 a new fix puts you 058°T, 2.6 nm from Heron Point Light.

   Plot the 1005 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 0820 your fix is 202°T, 2.3 nm from Gannet Rock daybeacon. You steer 272°T at 4.2 kn through the water. At 0930 a new fix puts you 039°T, 2.1 nm from Heron Point Light.

   Plot the 0930 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1435 your fix is 248°T, 2.5 nm from Gannet Rock daybeacon. You steer 324°T at 4.1 kn through the water. At 1520 a new fix puts you 049°T, 3.1 nm from Heron Point Light.

   Plot the 1520 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 0715 your fix is 076°T, 4.0 nm from Tern Island tower. You steer 280°T at 6.2 kn through the water. At 0745 a new fix puts you 038°T, 1.9 nm from Tern Island tower.

   Plot the 0745 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