Worksheet 15 · Skill 5

Set and drift

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1. At 1455 your fix is 049°T, 3.2 nm from Gannet Rock daybeacon. You steer 203°T at 5.4 kn through the water. At 1540 a new fix puts you 015°T, 2.1 nm from Kittle water tank.

   Plot the 1540 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 0845 your fix is 061°T, 3.7 nm from Westfield church spire. You steer 216°T at 4.6 kn through the water. At 0920 a new fix puts you 100°T, 3.0 nm from Westfield church spire.

   Plot the 0920 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  

3. At 1045 your fix is 009°T, 2.7 nm from Westfield church spire. You steer 127°T at 4.7 kn through the water. At 1135 a new fix puts you 079°T, 2.8 nm from Westfield church spire.

   Plot the 1135 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  

4. At 0705 your fix is 358°T, 2.8 nm from Mill stack. You steer 093°T at 5.2 kn through the water. At 0745 a new fix puts you 141°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0745 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 0850 your fix is 245°T, 1.5 nm from Tern Island tower. You steer 315°T at 4.2 kn through the water. At 0940 a new fix puts you 295°T, 3.6 nm from Tern Island tower.

   Plot the 0940 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 1350 your fix is 046°T, 2.2 nm from Heron Point Light. You steer 327°T at 7.6 kn through the water. At 1425 a new fix puts you 036°T, 2.6 nm from Westfield church spire.

   Plot the 1425 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 1000 your fix is 341°T, 2.7 nm from Mill stack. You steer 082°T at 5.5 kn through the water. At 1045 a new fix puts you 278°T, 1.5 nm from Gannet Rock daybeacon.

   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  

8. At 1330 your fix is 115°T, 1.4 nm from Tern Island tower. You steer 055°T at 6.3 kn through the water. At 1405 a new fix puts you 071°T, 5.1 nm from Tern Island tower.

   Plot the 1405 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