Worksheet 457 · Skill 5

Set and drift

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1. At 1130 your fix is 215°T, 1.3 nm from Tern Island tower. You steer 312°T at 7.8 kn through the water. At 1210 a new fix puts you 304°T, 4.4 nm from Tern Island tower.

   Plot the 1210 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 1245 your fix is 042°T, 1.8 nm from Heron Point Light. You steer 011°T at 5.4 kn through the water. At 1340 a new fix puts you 297°T, 3.2 nm from Tern Island tower.

   Plot the 1340 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  

3. At 0700 your fix is 008°T, 2.2 nm from Mill stack. You steer 099°T at 8.9 kn through the water. At 0735 a new fix puts you 339°T, 1.7 nm from Kittle water tank.

   Plot the 0735 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 1210 your fix is 212°T, 1.7 nm from Gannet Rock daybeacon. You steer 300°T at 4.8 kn through the water. At 1325 a new fix puts you 033°T, 3.5 nm from Heron Point Light.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1525 your fix is 278°T, 1.4 nm from Gannet Rock daybeacon. You steer 240°T at 7.7 kn through the water. At 1555 a new fix puts you 087°T, 1.9 nm from Heron Point Light.

   Plot the 1555 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 1550 your fix is 217°T, 2.1 nm from Tern Island tower. You steer 241°T at 4.8 kn through the water. At 1625 a new fix puts you 059°T, 1.2 nm from Heron Point Light.

   Plot the 1625 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  

7. At 1310 your fix is 154°T, 1.4 nm from Westfield church spire. You steer 029°T at 5.4 kn through the water. At 1410 a new fix puts you 324°T, 3.2 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 241°T, 2.5 nm from Tern Island tower. You steer 312°T at 4.7 kn through the water. At 1545 a new fix puts you 059°T, 3.9 nm from Westfield church spire.

   Plot the 1545 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