Worksheet 676 · Skill 5

Set and drift

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1. At 0700 your fix is 303°T, 3.6 nm from Tern Island tower. You steer 170°T at 5.6 kn through the water. At 0755 a new fix puts you 079°T, 2.3 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 230°T, 2.8 nm from Tern Island tower. You steer 112°T at 4.6 kn through the water. At 1620 a new fix puts you 301°T, 1.3 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1025 your fix is 009°T, 1.7 nm from Westfield church spire. You steer 114°T at 6.3 kn through the water. At 1155 a new fix puts you 132°T, 3.1 nm from Tern Island tower.

   Plot the 1155 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1055 your fix is 016°T, 1.8 nm from Tern Island tower. You steer 251°T at 8.9 kn through the water. At 1135 a new fix puts you 068°T, 2.0 nm from Westfield church spire.

   Plot the 1135 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  

5. At 1325 your fix is 168°T, 1.3 nm from Westfield church spire. You steer 043°T at 5.9 kn through the water. At 1355 a new fix puts you 066°T, 2.1 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 057°T, 1.4 nm from Westfield church spire. You steer 103°T at 4.8 kn through the water. At 0825 a new fix puts you 197°T, 1.3 nm from Tern Island tower.

   Plot the 0825 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 0800 your fix is 060°T, 2.3 nm from Tern Island tower. You steer 154°T at 7.9 kn through the water. At 0840 a new fix puts you 096°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1130 your fix is 328°T, 2.9 nm from Tern Island tower. You steer 099°T at 7.7 kn through the water. At 1205 a new fix puts you 061°T, 2.9 nm from Tern Island tower.

   Plot the 1205 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