Worksheet 302 · Skill 5

Set and drift

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1. At 1240 your fix is 304°T, 3.5 nm from Tern Island tower. You steer 154°T at 6.8 kn through the water. At 1330 a new fix puts you 267°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1330 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 1155 your fix is 302°T, 4.5 nm from Tern Island tower. You steer 214°T at 4.1 kn through the water. At 1255 a new fix puts you 031°T, 3.2 nm from Heron Point Light.

   Plot the 1255 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  

3. At 1140 your fix is 011°T, 2.7 nm from Westfield church spire. You steer 119°T at 5.0 kn through the water. At 1240 a new fix puts you 247°T, 3.4 nm from Tern Island tower.

   Plot the 1240 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  

4. At 0720 your fix is 030°T, 2.9 nm from Gannet Rock daybeacon. You steer 173°T at 5.4 kn through the water. At 0805 a new fix puts you 006°T, 1.9 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0810 your fix is 334°T, 1.0 nm from Kittle water tank. You steer 350°T at 6.8 kn through the water. At 0855 a new fix puts you 074°T, 2.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0720 your fix is 010°T, 1.1 nm from Heron Point Light. You steer 351°T at 8.7 kn through the water. At 0800 a new fix puts you 014°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1425 your fix is 002°T, 2.4 nm from Westfield church spire. You steer 115°T at 5.1 kn through the water. At 1515 a new fix puts you 288°T, 3.0 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1300 your fix is 049°T, 4.0 nm from Westfield church spire. You steer 175°T at 4.0 kn through the water. At 1410 a new fix puts you 045°T, 3.3 nm from Heron Point Light.

   Plot the 1410 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