Worksheet 533 · Skill 5

Set and drift

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1. At 1545 your fix is 117°T, 1.9 nm from Westfield church spire. You steer 100°T at 5.9 kn through the water. At 1645 a new fix puts you 198°T, 1.4 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1155 your fix is 026°T, 2.4 nm from Heron Point Light. You steer 346°T at 6.0 kn through the water. At 1240 a new fix puts you 053°T, 3.8 nm from Westfield church spire.

   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  

3. At 1125 your fix is 000°T, 1.4 nm from Westfield church spire. You steer 084°T at 7.3 kn through the water. At 1210 a new fix puts you 281°T, 1.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1155 your fix is 259°T, 2.0 nm from Tern Island tower. You steer 283°T at 4.7 kn through the water. At 1250 a new fix puts you 007°T, 2.6 nm from Westfield church spire.

   Plot the 1250 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  

5. At 1300 your fix is 229°T, 3.5 nm from Tern Island tower. You steer 274°T at 4.6 kn through the water. At 1355 a new fix puts you 007°T, 1.1 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1200 your fix is 070°T, 4.1 nm from Tern Island tower. You steer 279°T at 6.3 kn through the water. At 1305 a new fix puts you 291°T, 3.4 nm from Tern Island tower.

   Plot the 1305 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  

7. At 1220 your fix is 002°T, 1.5 nm from Kittle water tank. You steer 003°T at 7.5 kn through the water. At 1305 a new fix puts you 050°T, 3.3 nm from Tern Island tower.

   Plot the 1305 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 0740 your fix is 352°T, 3.3 nm from Mill stack. You steer 086°T at 4.2 kn through the water. At 0810 a new fix puts you 208°T, 2.6 nm from Tern Island tower.

   Plot the 0810 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