Worksheet 540 · Skill 5

Set and drift

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1. At 1215 your fix is 274°T, 1.2 nm from Gannet Rock daybeacon. You steer 248°T at 6.2 kn through the water. At 1250 a new fix puts you 000°T, 2.2 nm from Mill stack.

   Plot the 1250 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  

2. At 1020 your fix is 012°T, 2.9 nm from Westfield church spire. You steer 124°T at 4.0 kn through the water. At 1125 a new fix puts you 242°T, 3.1 nm from Tern Island tower.

   Plot the 1125 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 1235 your fix is 293°T, 3.4 nm from Tern Island tower. You steer 167°T at 6.2 kn through the water. At 1335 a new fix puts you 020°T, 2.8 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1120 your fix is 280°T, 3.7 nm from Tern Island tower. You steer 079°T at 6.1 kn through the water. At 1200 a new fix puts you 046°T, 2.2 nm from Tern Island tower.

   Plot the 1200 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 0725 your fix is 026°T, 3.3 nm from Westfield church spire. You steer 162°T at 5.7 kn through the water. At 0820 a new fix puts you 103°T, 2.7 nm from Westfield church spire.

   Plot the 0820 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  

6. At 1320 your fix is 071°T, 2.4 nm from Westfield church spire. You steer 128°T at 4.1 kn through the water. At 1445 a new fix puts you 239°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1445 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1540 your fix is 315°T, 1.8 nm from Tern Island tower. You steer 190°T at 5.7 kn through the water. At 1645 a new fix puts you 014°T, 2.5 nm from Mill stack.

   Plot the 1645 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  

8. At 1045 your fix is 084°T, 3.0 nm from Tern Island tower. You steer 156°T at 6.8 kn through the water. At 1115 a new fix puts you 080°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1115 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