Worksheet 107 · Skill 5

Set and drift

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1. At 0945 your fix is 342°T, 1.8 nm from Tern Island tower. You steer 106°T at 6.2 kn through the water. At 1025 a new fix puts you 026°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

2. At 1000 your fix is 090°T, 3.3 nm from Westfield church spire. You steer 325°T at 4.2 kn through the water. At 1045 a new fix puts you 041°T, 4.3 nm from Westfield church spire.

   Plot the 1045 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  

3. At 1530 your fix is 232°T, 2.2 nm from Gannet Rock daybeacon. You steer 267°T at 4.8 kn through the water. At 1600 a new fix puts you 335°T, 1.8 nm from Mill stack.

   Plot the 1600 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  

4. At 1215 your fix is 341°T, 1.5 nm from Heron Point Light. You steer 037°T at 4.3 kn through the water. At 1255 a new fix puts you 016°T, 2.2 nm from Heron Point Light.

   Plot the 1255 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 0700 your fix is 340°T, 1.5 nm from Tern Island tower. You steer 231°T at 5.1 kn through the water. At 0730 a new fix puts you 262°T, 3.2 nm from Tern Island tower.

   Plot the 0730 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 1555 your fix is 040°T, 3.5 nm from Heron Point Light. You steer 192°T at 5.2 kn through the water. At 1630 a new fix puts you 332°T, 1.6 nm from Mill stack.

   Plot the 1630 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  

7. At 1305 your fix is 105°T, 2.0 nm from Gannet Rock daybeacon. You steer 254°T at 5.0 kn through the water. At 1350 a new fix puts you 208°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1350 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  

8. At 1335 your fix is 115°T, 2.4 nm from Westfield church spire. You steer 022°T at 5.7 kn through the water. At 1410 a new fix puts you 281°T, 3.3 nm from Tern Island tower.

   Plot the 1410 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