Worksheet 8 · Skill 5

Set and drift

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1. At 1500 your fix is 070°T, 1.3 nm from Westfield church spire. You steer 138°T at 4.1 kn through the water. At 1545 a new fix puts you 142°T, 3.4 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0945 your fix is 062°T, 5.2 nm from Tern Island tower. You steer 241°T at 6.7 kn through the water. At 1015 a new fix puts you 072°T, 2.3 nm from Tern Island tower.

   Plot the 1015 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  

3. At 1445 your fix is 067°T, 1.4 nm from Westfield church spire. You steer 055°T at 5.9 kn through the water. At 1520 a new fix puts you 293°T, 2.2 nm from Tern Island tower.

   Plot the 1520 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  

4. At 1540 your fix is 253°T, 3.2 nm from Tern Island tower. You steer 292°T at 5.8 kn through the water. At 1610 a new fix puts you 054°T, 2.7 nm from Westfield church spire.

   Plot the 1610 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  

5. At 1525 your fix is 009°T, 1.8 nm from Mill stack. You steer 001°T at 6.4 kn through the water. At 1615 a new fix puts you 288°T, 1.9 nm from Tern Island tower.

   Plot the 1615 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  

6. At 1440 your fix is 229°T, 2.5 nm from Gannet Rock daybeacon. You steer 324°T at 9.0 kn through the water. At 1525 a new fix puts you 309°T, 4.0 nm from Tern Island tower.

   Plot the 1525 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  

7. At 1345 your fix is 053°T, 2.4 nm from Westfield church spire. You steer 061°T at 6.6 kn through the water. At 1420 a new fix puts you 306°T, 3.7 nm from Tern Island tower.

   Plot the 1420 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 0920 your fix is 260°T, 3.0 nm from Gannet Rock daybeacon. You steer 234°T at 4.0 kn through the water. At 1000 a new fix puts you 344°T, 1.5 nm from Mill stack.

   Plot the 1000 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