Worksheet 476 · Skill 5

Set and drift

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1. At 0940 your fix is 039°T, 2.5 nm from Westfield church spire. You steer 148°T at 7.4 kn through the water. At 1010 a new fix puts you 236°T, 3.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0735 your fix is 035°T, 1.1 nm from Westfield church spire. You steer 140°T at 6.0 kn through the water. At 0810 a new fix puts you 005°T, 1.9 nm from Heron Point Light.

   Plot the 0810 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  

3. At 0805 your fix is 113°T, 2.2 nm from Gannet Rock daybeacon. You steer 257°T at 5.1 kn through the water. At 0900 a new fix puts you 341°T, 1.7 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1405 your fix is 344°T, 1.1 nm from Kittle water tank. You steer 307°T at 6.3 kn through the water. At 1520 a new fix puts you 257°T, 2.9 nm from Tern Island tower.

   Plot the 1520 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  

5. At 1040 your fix is 029°T, 1.4 nm from Kittle water tank. You steer 003°T at 8.6 kn through the water. At 1120 a new fix puts you 064°T, 3.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1255 your fix is 295°T, 1.3 nm from Tern Island tower. You steer 246°T at 7.2 kn through the water. At 1325 a new fix puts you 099°T, 2.3 nm from Westfield church spire.

   Plot the 1325 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 1035 your fix is 058°T, 2.3 nm from Westfield church spire. You steer 071°T at 4.8 kn through the water. At 1145 a new fix puts you 329°T, 2.1 nm from Tern Island tower.

   Plot the 1145 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 0815 your fix is 029°T, 1.9 nm from Gannet Rock daybeacon. You steer 150°T at 4.9 kn through the water. At 0845 a new fix puts you 031°T, 2.0 nm from Kittle water tank.

   Plot the 0845 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