Worksheet 601 · Skill 5

Set and drift

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1. At 1310 your fix is 152°T, 2.4 nm from Tern Island tower. You steer 054°T at 4.4 kn through the water. At 1355 a new fix puts you 080°T, 2.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0815 your fix is 214°T, 2.4 nm from Tern Island tower. You steer 286°T at 4.8 kn through the water. At 0915 a new fix puts you 084°T, 2.3 nm from Westfield church spire.

   Plot the 0915 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  

3. At 1505 your fix is 051°T, 1.4 nm from Tern Island tower. You steer 143°T at 4.4 kn through the water. At 1540 a new fix puts you 060°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

4. At 0715 your fix is 239°T, 2.1 nm from Tern Island tower. You steer 227°T at 7.1 kn through the water. At 0745 a new fix puts you 037°T, 0.9 nm from Heron Point Light.

   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  

5. At 1430 your fix is 337°T, 1.2 nm from Heron Point Light. You steer 005°T at 6.0 kn through the water. At 1505 a new fix puts you 085°T, 2.9 nm from Westfield church spire.

   Plot the 1505 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  

6. At 1400 your fix is 115°T, 1.2 nm from Westfield church spire. You steer 060°T at 6.6 kn through the water. At 1450 a new fix puts you 274°T, 2.6 nm from Tern Island tower.

   Plot the 1450 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  

7. At 1025 your fix is 047°T, 2.2 nm from Heron Point Light. You steer 097°T at 6.2 kn through the water. At 1105 a new fix puts you 251°T, 2.0 nm from Gannet Rock daybeacon.

   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  

8. At 0925 your fix is 263°T, 2.6 nm from Gannet Rock daybeacon. You steer 298°T at 8.4 kn through the water. At 1005 a new fix puts you 075°T, 1.1 nm from Westfield church spire.

   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