Worksheet 907 · Skill 5

Set and drift

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1. At 1250 your fix is 239°T, 3.1 nm from Tern Island tower. You steer 119°T at 6.5 kn through the water. At 1340 a new fix puts you 176°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1340 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  

2. At 1120 your fix is 267°T, 2.0 nm from Gannet Rock daybeacon. You steer 068°T at 4.5 kn through the water. At 1205 a new fix puts you 021°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1205 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 1145 your fix is 278°T, 3.2 nm from Tern Island tower. You steer 137°T at 5.3 kn through the water. At 1230 a new fix puts you 264°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1230 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 0925 your fix is 034°T, 3.4 nm from Westfield church spire. You steer 091°T at 4.5 kn through the water. At 1025 a new fix puts you 357°T, 2.2 nm from Tern Island tower.

   Plot the 1025 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0735 your fix is 035°T, 3.5 nm from Gannet Rock daybeacon. You steer 272°T at 4.2 kn through the water. At 0805 a new fix puts you 106°T, 1.5 nm from Tern Island tower.

   Plot the 0805 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  

6. At 1235 your fix is 340°T, 2.2 nm from Mill stack. You steer 292°T at 4.1 kn through the water. At 1315 a new fix puts you 345°T, 2.0 nm from Heron Point Light.

   Plot the 1315 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  

7. At 1320 your fix is 337°T, 1.5 nm from Heron Point Light. You steer 059°T at 7.6 kn through the water. At 1355 a new fix puts you 224°T, 2.6 nm from Tern Island tower.

   Plot the 1355 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 0735 your fix is 047°T, 2.1 nm from Kittle water tank. You steer 327°T at 5.6 kn through the water. At 0840 a new fix puts you 078°T, 2.8 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn