Worksheet 178 · Skill 5

Set and drift

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1. At 1025 your fix is 073°T, 1.1 nm from Westfield church spire. You steer 045°T at 4.1 kn through the water. At 1105 a new fix puts you 067°T, 3.4 nm from Westfield church spire.

   Plot the 1105 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 0805 your fix is 260°T, 3.1 nm from Tern Island tower. You steer 107°T at 8.6 kn through the water. At 0855 a new fix puts you 332°T, 1.5 nm from Kittle water tank.

   Plot the 0855 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  

3. At 1045 your fix is 359°T, 1.6 nm from Kittle water tank. You steer 271°T at 6.5 kn through the water. At 1120 a new fix puts you 238°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1120 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  

4. At 0715 your fix is 023°T, 2.7 nm from Heron Point Light. You steer 015°T at 4.4 kn through the water. At 0755 a new fix puts you 284°T, 4.0 nm from Tern Island tower.

   Plot the 0755 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  

5. At 1105 your fix is 041°T, 3.9 nm from Gannet Rock daybeacon. You steer 173°T at 4.4 kn through the water. At 1220 a new fix puts you 151°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1220 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  

6. At 1220 your fix is 264°T, 3.6 nm from Tern Island tower. You steer 108°T at 5.1 kn through the water. At 1300 a new fix puts you 230°T, 2.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0920 your fix is 023°T, 2.4 nm from Heron Point Light. You steer 159°T at 4.5 kn through the water. At 0955 a new fix puts you 076°T, 1.9 nm from Heron Point Light.

   Plot the 0955 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 0750 your fix is 026°T, 1.7 nm from Gannet Rock daybeacon. You steer 341°T at 5.7 kn through the water. At 0825 a new fix puts you 053°T, 1.9 nm from Tern Island tower.

   Plot the 0825 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