Worksheet 463 · Skill 5

Set and drift

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1. At 1535 your fix is 031°T, 3.0 nm from Kittle water tank. You steer 270°T at 7.2 kn through the water. At 1645 a new fix puts you 045°T, 1.5 nm from Heron Point Light.

   Plot the 1645 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1245 your fix is 223°T, 2.7 nm from Tern Island tower. You steer 272°T at 7.5 kn through the water. At 1320 a new fix puts you 091°T, 1.7 nm from Westfield church spire.

   Plot the 1320 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 1505 your fix is 004°T, 1.4 nm from Kittle water tank. You steer 294°T at 4.8 kn through the water. At 1550 a new fix puts you 261°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1550 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 1055 your fix is 027°T, 3.3 nm from Heron Point Light. You steer 326°T at 6.9 kn through the water. At 1125 a new fix puts you 015°T, 2.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 220°T, 3.4 nm from Tern Island tower. You steer 282°T at 4.9 kn through the water. At 1410 a new fix puts you 099°T, 2.0 nm from Westfield church spire.

   Plot the 1410 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 1320 your fix is 000°T, 1.7 nm from Westfield church spire. You steer 135°T at 4.7 kn through the water. At 1430 a new fix puts you 091°T, 1.4 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1035 your fix is 175°T, 1.4 nm from Westfield church spire. You steer 064°T at 4.0 kn through the water. At 1130 a new fix puts you 241°T, 2.0 nm from Tern Island tower.

   Plot the 1130 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 0720 your fix is 223°T, 3.2 nm from Tern Island tower. You steer 331°T at 6.6 kn through the water. At 0750 a new fix puts you 263°T, 3.7 nm from Tern Island tower.

   Plot the 0750 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