Worksheet 524 · Skill 5

Set and drift

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1. At 1455 your fix is 273°T, 3.4 nm from Tern Island tower. You steer 293°T at 6.8 kn through the water. At 1525 a new fix puts you 025°T, 3.1 nm from Westfield church spire.

   Plot the 1525 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  

2. At 1225 your fix is 061°T, 3.0 nm from Westfield church spire. You steer 142°T at 6.0 kn through the water. At 1305 a new fix puts you 234°T, 2.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1405 your fix is 059°T, 2.9 nm from Westfield church spire. You steer 164°T at 5.0 kn through the water. At 1445 a new fix puts you 016°T, 1.6 nm from Heron Point Light.

   Plot the 1445 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 1115 your fix is 070°T, 0.9 nm from Heron Point Light. You steer 025°T at 8.8 kn through the water. At 1200 a new fix puts you 326°T, 1.6 nm from Tern Island tower.

   Plot the 1200 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 1200 your fix is 357°T, 3.0 nm from Mill stack. You steer 303°T at 8.5 kn through the water. At 1235 a new fix puts you 038°T, 1.8 nm from Westfield church spire.

   Plot the 1235 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  

6. At 1200 your fix is 258°T, 1.6 nm from Tern Island tower. You steer 183°T at 4.8 kn through the water. At 1230 a new fix puts you 199°T, 2.6 nm from Tern Island tower.

   Plot the 1230 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  

7. At 1020 your fix is 348°T, 2.4 nm from Tern Island tower. You steer 198°T at 4.1 kn through the water. At 1100 a new fix puts you 255°T, 2.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1510 your fix is 297°T, 3.1 nm from Tern Island tower. You steer 187°T at 4.2 kn through the water. At 1555 a new fix puts you 213°T, 3.0 nm from Tern Island tower.

   Plot the 1555 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