Worksheet 876 · Skill 5

Set and drift

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1. At 1535 your fix is 359°T, 2.0 nm from Heron Point Light. You steer 115°T at 6.8 kn through the water. At 1620 a new fix puts you 324°T, 1.0 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1415 your fix is 297°T, 2.6 nm from Tern Island tower. You steer 160°T at 8.7 kn through the water. At 1500 a new fix puts you 044°T, 2.1 nm from Mill stack.

   Plot the 1500 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 1145 your fix is 099°T, 1.8 nm from Westfield church spire. You steer 040°T at 6.3 kn through the water. At 1215 a new fix puts you 061°T, 3.3 nm from Westfield church spire.

   Plot the 1215 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 1115 your fix is 346°T, 2.6 nm from Mill stack. You steer 307°T at 5.8 kn through the water. At 1150 a new fix puts you 099°T, 2.9 nm from Westfield church spire.

   Plot the 1150 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  

5. At 1020 your fix is 268°T, 2.0 nm from Tern Island tower. You steer 197°T at 5.0 kn through the water. At 1050 a new fix puts you 224°T, 3.3 nm from Tern Island tower.

   Plot the 1050 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 1320 your fix is 071°T, 3.6 nm from Westfield church spire. You steer 067°T at 6.9 kn through the water. At 1410 a new fix puts you 025°T, 1.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1310 your fix is 244°T, 2.7 nm from Tern Island tower. You steer 340°T at 4.6 kn through the water. At 1355 a new fix puts you 299°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1410 your fix is 034°T, 4.0 nm from Westfield church spire. You steer 141°T at 4.3 kn through the water. At 1450 a new fix puts you 292°T, 2.1 nm from Tern Island tower.

   Plot the 1450 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