Worksheet 564 · Skill 5

Set and drift

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1. At 0825 your fix is 242°T, 1.9 nm from Gannet Rock daybeacon. You steer 278°T at 4.6 kn through the water. At 0945 a new fix puts you 019°T, 2.9 nm from Heron Point Light.

   Plot the 0945 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0705 your fix is 268°T, 2.7 nm from Gannet Rock daybeacon. You steer 294°T at 4.7 kn through the water. At 0820 a new fix puts you 070°T, 3.0 nm from Westfield church spire.

   Plot the 0820 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 007°T, 2.6 nm from Westfield church spire. You steer 130°T at 4.4 kn through the water. At 1215 a new fix puts you 069°T, 3.2 nm from Westfield church spire.

   Plot the 1215 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  

4. At 1100 your fix is 030°T, 4.1 nm from Westfield church spire. You steer 174°T at 7.3 kn through the water. At 1135 a new fix puts you 081°T, 3.0 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0935 your fix is 005°T, 1.4 nm from Kittle water tank. You steer 357°T at 6.9 kn through the water. At 1020 a new fix puts you 072°T, 2.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0930 your fix is 056°T, 3.7 nm from Tern Island tower. You steer 173°T at 5.6 kn through the water. At 1005 a new fix puts you 054°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 1005 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  

7. At 1325 your fix is 029°T, 2.6 nm from Heron Point Light. You steer 078°T at 8.2 kn through the water. At 1415 a new fix puts you 044°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

8. At 0905 your fix is 026°T, 2.2 nm from Tern Island tower. You steer 096°T at 5.2 kn through the water. At 0945 a new fix puts you 034°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 0945 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