Worksheet 891 · Skill 5

Set and drift

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1. At 1250 your fix is 259°T, 3.1 nm from Tern Island tower. You steer 358°T at 5.2 kn through the water. At 1325 a new fix puts you 313°T, 3.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0815 your fix is 012°T, 2.5 nm from Tern Island tower. You steer 148°T at 8.1 kn through the water. At 0910 a new fix puts you 077°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 0910 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 1155 your fix is 066°T, 3.8 nm from Tern Island tower. You steer 193°T at 8.5 kn through the water. At 1240 a new fix puts you 291°T, 1.5 nm from Kittle water tank.

   Plot the 1240 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  

4. At 0910 your fix is 293°T, 4.0 nm from Tern Island tower. You steer 230°T at 4.7 kn through the water. At 0945 a new fix puts you 071°T, 1.7 nm from Westfield church spire.

   Plot the 0945 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  

5. At 1410 your fix is 003°T, 1.6 nm from Heron Point Light. You steer 056°T at 5.7 kn through the water. At 1500 a new fix puts you 279°T, 3.0 nm from Tern Island tower.

   Plot the 1500 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0915 your fix is 038°T, 2.6 nm from Gannet Rock daybeacon. You steer 330°T at 4.4 kn through the water. At 1000 a new fix puts you 055°T, 3.0 nm from Tern Island tower.

   Plot the 1000 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 1225 your fix is 345°T, 1.8 nm from Heron Point Light. You steer 069°T at 5.7 kn through the water. At 1255 a new fix puts you 051°T, 3.3 nm from Heron Point Light.

   Plot the 1255 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  

8. At 1430 your fix is 044°T, 1.6 nm from Heron Point Light. You steer 064°T at 4.4 kn through the water. At 1505 a new fix puts you 217°T, 2.5 nm from Tern Island tower.

   Plot the 1505 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