Worksheet 883 · Skill 5

Set and drift

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1. At 0930 your fix is 252°T, 3.3 nm from Tern Island tower. You steer 048°T at 5.7 kn through the water. At 1020 a new fix puts you 341°T, 1.3 nm from Tern Island tower.

   Plot the 1020 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  

2. At 0730 your fix is 275°T, 2.3 nm from Gannet Rock daybeacon. You steer 290°T at 6.0 kn through the water. At 0800 a new fix puts you 262°T, 3.4 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1200 your fix is 018°T, 3.7 nm from Westfield church spire. You steer 156°T at 7.1 kn through the water. At 1305 a new fix puts you 011°T, 1.1 nm from Mill stack.

   Plot the 1305 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 024°T, 1.7 nm from Westfield church spire. You steer 146°T at 7.4 kn through the water. At 0815 a new fix puts you 078°T, 2.3 nm from Heron Point Light.

   Plot the 0815 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 1225 your fix is 227°T, 1.9 nm from Gannet Rock daybeacon. You steer 300°T at 6.0 kn through the water. At 1340 a new fix puts you 026°T, 3.6 nm from Westfield church spire.

   Plot the 1340 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  

6. At 0755 your fix is 213°T, 1.5 nm from Gannet Rock daybeacon. You steer 272°T at 5.8 kn through the water. At 0850 a new fix puts you 068°T, 2.4 nm from Heron Point Light.

   Plot the 0850 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  

7. At 0910 your fix is 032°T, 2.7 nm from Gannet Rock daybeacon. You steer 242°T at 4.5 kn through the water. At 0945 a new fix puts you 017°T, 1.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1300 your fix is 297°T, 4.3 nm from Tern Island tower. You steer 191°T at 6.0 kn through the water. At 1335 a new fix puts you 249°T, 3.3 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn