Worksheet 807 · Skill 5

Set and drift

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1. At 1150 your fix is 017°T, 3.6 nm from Westfield church spire. You steer 172°T at 5.0 kn through the water. At 1240 a new fix puts you 090°T, 2.9 nm from Westfield church spire.

   Plot the 1240 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 0700 your fix is 041°T, 4.6 nm from Westfield church spire. You steer 093°T at 6.9 kn through the water. At 0815 a new fix puts you 024°T, 3.0 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0840 your fix is 087°T, 2.5 nm from Gannet Rock daybeacon. You steer 359°T at 5.4 kn through the water. At 0930 a new fix puts you 073°T, 4.0 nm from Tern Island tower.

   Plot the 0930 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  

4. At 1135 your fix is 229°T, 1.4 nm from Tern Island tower. You steer 276°T at 4.5 kn through the water. At 1225 a new fix puts you 088°T, 3.3 nm from Westfield church spire.

   Plot the 1225 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  

5. At 1015 your fix is 011°T, 3.0 nm from Mill stack. You steer 342°T at 7.3 kn through the water. At 1100 a new fix puts you 050°T, 3.6 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0755 your fix is 297°T, 1.9 nm from Tern Island tower. You steer 297°T at 5.3 kn through the water. At 0825 a new fix puts you 303°T, 3.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1415 your fix is 006°T, 2.5 nm from Westfield church spire. You steer 126°T at 6.1 kn through the water. At 1545 a new fix puts you 157°T, 2.7 nm from Tern Island tower.

   Plot the 1545 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  

8. At 1220 your fix is 070°T, 2.5 nm from Heron Point Light. You steer 291°T at 5.3 kn through the water. At 1305 a new fix puts you 176°T, 1.4 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn