Worksheet 140 · Skill 5

Set and drift

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1. At 0845 your fix is 206°T, 3.0 nm from Tern Island tower. You steer 106°T at 4.2 kn through the water. At 0955 a new fix puts you 281°T, 2.3 nm from Kittle water tank.

   Plot the 0955 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  

2. At 1535 your fix is 069°T, 3.1 nm from Westfield church spire. You steer 159°T at 7.4 kn through the water. At 1615 a new fix puts you 353°T, 2.0 nm from Mill stack.

   Plot the 1615 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 1325 your fix is 145°T, 1.3 nm from Tern Island tower. You steer 248°T at 5.7 kn through the water. At 1405 a new fix puts you 066°T, 3.0 nm from Heron Point Light.

   Plot the 1405 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  

4. At 0910 your fix is 069°T, 4.3 nm from Tern Island tower. You steer 270°T at 4.5 kn through the water. At 1005 a new fix puts you 332°T, 2.1 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1430 your fix is 274°T, 2.3 nm from Tern Island tower. You steer 274°T at 5.2 kn through the water. At 1515 a new fix puts you 046°T, 2.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1400 your fix is 211°T, 2.2 nm from Gannet Rock daybeacon. You steer 284°T at 4.4 kn through the water. At 1500 a new fix puts you 342°T, 1.6 nm from Heron Point Light.

   Plot the 1500 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  

7. At 1425 your fix is 238°T, 3.2 nm from Tern Island tower. You steer 241°T at 4.3 kn through the water. At 1510 a new fix puts you 018°T, 1.6 nm from Heron Point Light.

   Plot the 1510 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 1100 your fix is 045°T, 2.5 nm from Heron Point Light. You steer 014°T at 5.5 kn through the water. At 1140 a new fix puts you 258°T, 3.2 nm from Tern Island tower.

   Plot the 1140 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