Worksheet 813 · Skill 5

Set and drift

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1. At 1525 your fix is 044°T, 2.2 nm from Heron Point Light. You steer 095°T at 5.6 kn through the water. At 1645 a new fix puts you 298°T, 1.3 nm from Kittle water tank.

   Plot the 1645 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1225 your fix is 090°T, 1.6 nm from Heron Point Light. You steer 053°T at 4.7 kn through the water. At 1320 a new fix puts you 268°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1320 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 0850 your fix is 024°T, 1.7 nm from Kittle water tank. You steer 359°T at 7.0 kn through the water. At 0930 a new fix puts you 032°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 0930 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  

4. At 0835 your fix is 299°T, 2.0 nm from Kittle water tank. You steer 048°T at 5.3 kn through the water. At 0920 a new fix puts you 038°T, 3.0 nm from Kittle water tank.

   Plot the 0920 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 1130 your fix is 318°T, 2.3 nm from Tern Island tower. You steer 266°T at 4.0 kn through the water. At 1210 a new fix puts you 292°T, 4.1 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  

6. At 1150 your fix is 022°T, 1.3 nm from Kittle water tank. You steer 283°T at 6.2 kn through the water. At 1225 a new fix puts you 197°T, 1.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1555 your fix is 087°T, 2.5 nm from Westfield church spire. You steer 113°T at 4.9 kn through the water. At 1655 a new fix puts you 214°T, 2.9 nm from Tern Island tower.

   Plot the 1655 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 1000 your fix is 005°T, 1.5 nm from Heron Point Light. You steer 056°T at 5.4 kn through the water. At 1030 a new fix puts you 086°T, 3.7 nm from Westfield church spire.

   Plot the 1030 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