Worksheet 16 · Skill 5

Set and drift

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1. At 1220 your fix is 068°T, 2.8 nm from Westfield church spire. You steer 061°T at 7.2 kn through the water. At 1305 a new fix puts you 038°T, 1.8 nm from Tern Island tower.

   Plot the 1305 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  

2. At 1145 your fix is 354°T, 1.9 nm from Tern Island tower. You steer 257°T at 5.0 kn through the water. At 1235 a new fix puts you 290°T, 4.2 nm from Tern Island tower.

   Plot the 1235 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 1535 your fix is 255°T, 1.0 nm from Gannet Rock daybeacon. You steer 264°T at 4.6 kn through the water. At 1705 a new fix puts you 328°T, 3.1 nm from Heron Point Light.

   Plot the 1705 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1440 your fix is 228°T, 2.7 nm from Tern Island tower. You steer 075°T at 4.2 kn through the water. At 1515 a new fix puts you 342°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1515 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 0925 your fix is 034°T, 2.6 nm from Kittle water tank. You steer 307°T at 5.9 kn through the water. At 1010 a new fix puts you 168°T, 1.3 nm from Tern Island tower.

   Plot the 1010 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 1050 your fix is 330°T, 1.9 nm from Tern Island tower. You steer 233°T at 4.8 kn through the water. At 1155 a new fix puts you 049°T, 3.4 nm from Heron Point Light.

   Plot the 1155 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  

7. At 1400 your fix is 326°T, 3.0 nm from Tern Island tower. You steer 088°T at 5.3 kn through the water. At 1435 a new fix puts you 013°T, 1.9 nm from Tern Island tower.

   Plot the 1435 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 0800 your fix is 006°T, 1.6 nm from Tern Island tower. You steer 266°T at 5.7 kn through the water. At 0900 a new fix puts you 047°T, 3.5 nm from Westfield church spire.

   Plot the 0900 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