Worksheet 63 · Skill 5

Set and drift

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1. At 1305 your fix is 108°T, 1.1 nm from Westfield church spire. You steer 359°T at 5.7 kn through the water. At 1335 a new fix puts you 036°T, 3.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1155 your fix is 004°T, 1.3 nm from Heron Point Light. You steer 102°T at 6.9 kn through the water. At 1300 a new fix puts you 229°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1300 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  

3. At 1205 your fix is 000°T, 1.6 nm from Mill stack. You steer 334°T at 8.7 kn through the water. At 1245 a new fix puts you 044°T, 2.5 nm from Westfield church spire.

   Plot the 1245 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 1230 your fix is 071°T, 2.2 nm from Gannet Rock daybeacon. You steer 263°T at 6.1 kn through the water. At 1315 a new fix puts you 281°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1315 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 1525 your fix is 008°T, 2.6 nm from Westfield church spire. You steer 077°T at 8.6 kn through the water. At 1555 a new fix puts you 295°T, 3.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0840 your fix is 106°T, 1.8 nm from Tern Island tower. You steer 236°T at 5.3 kn through the water. At 0935 a new fix puts you 335°T, 1.3 nm from Mill stack.

   Plot the 0935 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 0840 your fix is 328°T, 2.2 nm from Tern Island tower. You steer 261°T at 9.0 kn through the water. At 0915 a new fix puts you 032°T, 2.4 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1205 your fix is 011°T, 2.5 nm from Westfield church spire. You steer 124°T at 6.9 kn through the water. At 1320 a new fix puts you 008°T, 2.8 nm from Mill stack.

   Plot the 1320 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