Worksheet 90 · Skill 5

Set and drift

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1. At 1050 your fix is 030°T, 3.4 nm from Heron Point Light. You steer 028°T at 6.1 kn through the water. At 1135 a new fix puts you 299°T, 3.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1305 your fix is 143°T, 1.9 nm from Westfield church spire. You steer 082°T at 7.9 kn through the water. At 1335 a new fix puts you 239°T, 2.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1155 your fix is 066°T, 3.1 nm from Westfield church spire. You steer 292°T at 4.8 kn through the water. At 1225 a new fix puts you 008°T, 1.0 nm from Westfield church spire.

   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  

4. At 1455 your fix is 243°T, 3.3 nm from Tern Island tower. You steer 258°T at 5.8 kn through the water. At 1540 a new fix puts you 357°T, 1.5 nm from Heron Point Light.

   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  

5. At 1355 your fix is 339°T, 1.8 nm from Tern Island tower. You steer 106°T at 7.5 kn through the water. At 1430 a new fix puts you 032°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1430 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  

6. At 0845 your fix is 327°T, 1.5 nm from Tern Island tower. You steer 200°T at 8.9 kn through the water. At 0930 a new fix puts you 066°T, 1.4 nm from Heron Point Light.

   Plot the 0930 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 1030 your fix is 047°T, 1.6 nm from Heron Point Light. You steer 091°T at 8.2 kn through the water. At 1125 a new fix puts you 060°T, 1.6 nm from Kittle water tank.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 033°T, 2.1 nm from Mill stack. You steer 261°T at 4.2 kn through the water. At 1300 a new fix puts you 354°T, 1.3 nm from Mill stack.

   Plot the 1300 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