Worksheet 331 · Skill 5

Set and drift

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1. At 0920 your fix is 052°T, 2.7 nm from Tern Island tower. You steer 098°T at 4.6 kn through the water. At 0955 a new fix puts you 060°T, 4.2 nm from Tern Island tower.

   Plot the 0955 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  

2. At 1120 your fix is 132°T, 1.5 nm from Westfield church spire. You steer 097°T at 5.8 kn through the water. At 1225 a new fix puts you 322°T, 3.2 nm from Kittle water tank.

   Plot the 1225 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  

3. At 1555 your fix is 161°T, 0.8 nm from Gannet Rock daybeacon. You steer 029°T at 8.6 kn through the water. At 1630 a new fix puts you 037°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 1630 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 1135 your fix is 030°T, 2.8 nm from Kittle water tank. You steer 316°T at 6.8 kn through the water. At 1215 a new fix puts you 023°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1215 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  

5. At 1030 your fix is 029°T, 3.7 nm from Heron Point Light. You steer 351°T at 4.6 kn through the water. At 1115 a new fix puts you 028°T, 3.7 nm from Westfield church spire.

   Plot the 1115 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 1340 your fix is 097°T, 3.3 nm from Westfield church spire. You steer 135°T at 5.9 kn through the water. At 1435 a new fix puts you 014°T, 2.8 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1320 your fix is 040°T, 3.0 nm from Westfield church spire. You steer 108°T at 4.1 kn through the water. At 1355 a new fix puts you 287°T, 2.5 nm from Tern Island tower.

   Plot the 1355 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 1240 your fix is 226°T, 1.2 nm from Gannet Rock daybeacon. You steer 315°T at 7.3 kn through the water. At 1325 a new fix puts you 250°T, 2.5 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn