Worksheet 273 · Skill 5

Set and drift

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1. At 1335 your fix is 298°T, 2.2 nm from Tern Island tower. You steer 197°T at 6.2 kn through the water. At 1415 a new fix puts you 040°T, 3.1 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0850 your fix is 023°T, 1.6 nm from Tern Island tower. You steer 275°T at 5.5 kn through the water. At 1005 a new fix puts you 041°T, 3.6 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0740 your fix is 357°T, 1.3 nm from Kittle water tank. You steer 283°T at 6.1 kn through the water. At 0820 a new fix puts you 233°T, 1.5 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 274°T, 2.3 nm from Gannet Rock daybeacon. You steer 314°T at 8.5 kn through the water. At 0800 a new fix puts you 066°T, 3.2 nm from Westfield church spire.

   Plot the 0800 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 0715 your fix is 350°T, 1.8 nm from Heron Point Light. You steer 005°T at 8.0 kn through the water. At 0745 a new fix puts you 034°T, 3.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1020 your fix is 256°T, 3.2 nm from Tern Island tower. You steer 313°T at 7.2 kn through the water. At 1050 a new fix puts you 024°T, 2.4 nm from Westfield church spire.

   Plot the 1050 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  

7. At 1425 your fix is 350°T, 1.7 nm from Heron Point Light. You steer 097°T at 7.2 kn through the water. At 1535 a new fix puts you 342°T, 1.0 nm from Kittle water tank.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1250 your fix is 088°T, 3.3 nm from Westfield church spire. You steer 181°T at 5.9 kn through the water. At 1320 a new fix puts you 047°T, 1.9 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn