Worksheet 98 · Skill 5

Set and drift

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1. At 1020 your fix is 000°T, 2.6 nm from Mill stack. You steer 064°T at 4.9 kn through the water. At 1150 a new fix puts you 047°T, 2.5 nm from Gannet Rock daybeacon.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1155 your fix is 080°T, 2.2 nm from Tern Island tower. You steer 174°T at 7.2 kn through the water. At 1225 a new fix puts you 132°T, 3.0 nm from Tern Island tower.

   Plot the 1225 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 0820 your fix is 097°T, 3.0 nm from Westfield church spire. You steer 350°T at 5.9 kn through the water. At 0900 a new fix puts you 037°T, 4.5 nm from Westfield church spire.

   Plot the 0900 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  

4. At 0735 your fix is 008°T, 1.8 nm from Westfield church spire. You steer 082°T at 7.9 kn through the water. At 0905 a new fix puts you 055°T, 4.5 nm from Tern Island tower.

   Plot the 0905 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1130 your fix is 053°T, 2.3 nm from Heron Point Light. You steer 102°T at 5.6 kn through the water. At 1255 a new fix puts you 225°T, 1.2 nm from Gannet Rock daybeacon.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1130 your fix is 044°T, 2.4 nm from Heron Point Light. You steer 028°T at 7.1 kn through the water. At 1215 a new fix puts you 003°T, 2.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1550 your fix is 234°T, 1.8 nm from Gannet Rock daybeacon. You steer 326°T at 4.8 kn through the water. At 1720 a new fix puts you 311°T, 3.7 nm from Tern Island tower.

   Plot the 1720 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1450 your fix is 076°T, 3.3 nm from Westfield church spire. You steer 204°T at 5.1 kn through the water. At 1525 a new fix puts you 050°T, 1.3 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn