Worksheet 894 · Skill 5

Set and drift

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1. At 1140 your fix is 043°T, 2.5 nm from Westfield church spire. You steer 159°T at 7.4 kn through the water. At 1225 a new fix puts you 083°T, 0.8 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1100 your fix is 011°T, 1.9 nm from Kittle water tank. You steer 275°T at 4.1 kn through the water. At 1135 a new fix puts you 187°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1135 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 0705 your fix is 254°T, 1.8 nm from Tern Island tower. You steer 144°T at 8.5 kn through the water. At 0735 a new fix puts you 237°T, 2.4 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1030 your fix is 141°T, 2.4 nm from Tern Island tower. You steer 266°T at 4.8 kn through the water. At 1110 a new fix puts you 244°T, 3.4 nm from Tern Island tower.

   Plot the 1110 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 0755 your fix is 053°T, 2.1 nm from Gannet Rock daybeacon. You steer 350°T at 4.8 kn through the water. At 0825 a new fix puts you 033°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 0825 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 1100 your fix is 013°T, 1.7 nm from Westfield church spire. You steer 093°T at 6.0 kn through the water. At 1145 a new fix puts you 262°T, 2.7 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1310 your fix is 013°T, 2.4 nm from Heron Point Light. You steer 007°T at 5.3 kn through the water. At 1355 a new fix puts you 310°T, 4.0 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0945 your fix is 257°T, 2.5 nm from Tern Island tower. You steer 109°T at 4.8 kn through the water. At 1100 a new fix puts you 091°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1100 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