Worksheet 262 · Skill 5

Set and drift

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1. At 1035 your fix is 224°T, 2.9 nm from Tern Island tower. You steer 089°T at 7.1 kn through the water. At 1120 a new fix puts you 031°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1120 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 1540 your fix is 068°T, 1.4 nm from Westfield church spire. You steer 013°T at 4.1 kn through the water. At 1625 a new fix puts you 023°T, 3.2 nm from Westfield church spire.

   Plot the 1625 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 0810 your fix is 352°T, 1.6 nm from Gannet Rock daybeacon. You steer 057°T at 4.6 kn through the water. At 0840 a new fix puts you 040°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1405 your fix is 046°T, 4.2 nm from Gannet Rock daybeacon. You steer 179°T at 4.8 kn through the water. At 1455 a new fix puts you 061°T, 1.4 nm from Kittle water tank.

   Plot the 1455 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  

5. At 1005 your fix is 234°T, 2.3 nm from Gannet Rock daybeacon. You steer 316°T at 4.0 kn through the water. At 1045 a new fix puts you 228°T, 2.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0815 your fix is 030°T, 0.9 nm from Heron Point Light. You steer 015°T at 6.5 kn through the water. At 0905 a new fix puts you 299°T, 3.7 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 061°T, 2.9 nm from Tern Island tower. You steer 283°T at 8.5 kn through the water. At 1030 a new fix puts you 317°T, 3.1 nm from Tern Island tower.

   Plot the 1030 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 0945 your fix is 066°T, 2.9 nm from Tern Island tower. You steer 064°T at 4.6 kn through the water. At 1020 a new fix puts you 042°T, 4.7 nm from Gannet Rock daybeacon.

   Plot the 1020 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