Worksheet 839 · Skill 5

Set and drift

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1. At 1045 your fix is 049°T, 3.2 nm from Heron Point Light. You steer 056°T at 4.1 kn through the water. At 1125 a new fix puts you 267°T, 1.2 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1505 your fix is 294°T, 1.7 nm from Tern Island tower. You steer 251°T at 5.8 kn through the water. At 1535 a new fix puts you 278°T, 3.8 nm from Tern Island tower.

   Plot the 1535 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 0700 your fix is 229°T, 2.0 nm from Tern Island tower. You steer 243°T at 5.2 kn through the water. At 0745 a new fix puts you 016°T, 1.9 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1105 your fix is 329°T, 2.3 nm from Tern Island tower. You steer 209°T at 6.7 kn through the water. At 1140 a new fix puts you 235°T, 2.9 nm from Tern Island tower.

   Plot the 1140 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  

5. At 0715 your fix is 034°T, 2.1 nm from Tern Island tower. You steer 125°T at 4.7 kn through the water. At 0810 a new fix puts you 044°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 0810 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  

6. At 1430 your fix is 118°T, 1.8 nm from Gannet Rock daybeacon. You steer 261°T at 5.5 kn through the water. At 1515 a new fix puts you 206°T, 2.5 nm from Tern Island tower.

   Plot the 1515 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 1250 your fix is 070°T, 2.8 nm from Westfield church spire. You steer 134°T at 6.9 kn through the water. At 1325 a new fix puts you 218°T, 3.2 nm from Tern Island tower.

   Plot the 1325 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 1300 your fix is 255°T, 3.0 nm from Tern Island tower. You steer 278°T at 4.8 kn through the water. At 1345 a new fix puts you 104°T, 2.2 nm from Westfield church spire.

   Plot the 1345 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