Worksheet 861 · Skill 5

Set and drift

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1. At 1540 your fix is 260°T, 3.5 nm from Tern Island tower. You steer 174°T at 5.5 kn through the water. At 1620 a new fix puts you 066°T, 2.4 nm from Heron Point Light.

   Plot the 1620 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  

2. At 1010 your fix is 141°T, 1.4 nm from Westfield church spire. You steer 045°T at 4.2 kn through the water. At 1100 a new fix puts you 260°T, 2.9 nm from Tern Island tower.

   Plot the 1100 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  

3. At 1015 your fix is 353°T, 2.1 nm from Tern Island tower. You steer 113°T at 5.1 kn through the water. At 1055 a new fix puts you 052°T, 2.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0710 your fix is 233°T, 1.8 nm from Tern Island tower. You steer 295°T at 4.9 kn through the water. At 0755 a new fix puts you 060°T, 2.5 nm from Westfield church spire.

   Plot the 0755 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  

5. At 0915 your fix is 071°T, 1.8 nm from Westfield church spire. You steer 107°T at 5.9 kn through the water. At 1025 a new fix puts you 267°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

6. At 1520 your fix is 090°T, 2.6 nm from Westfield church spire. You steer 128°T at 7.2 kn through the water. At 1555 a new fix puts you 026°T, 1.6 nm from Mill stack.

   Plot the 1555 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  

7. At 1405 your fix is 316°T, 2.7 nm from Tern Island tower. You steer 176°T at 4.1 kn through the water. At 1520 a new fix puts you 245°T, 2.4 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0930 your fix is 061°T, 4.3 nm from Tern Island tower. You steer 260°T at 5.0 kn through the water. At 1045 a new fix puts you 298°T, 4.2 nm from Tern Island tower.

   Plot the 1045 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