Worksheet 760 · Skill 5

Set and drift

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1. At 0755 your fix is 050°T, 3.5 nm from Tern Island tower. You steer 161°T at 5.9 kn through the water. At 0910 a new fix puts you 047°T, 2.1 nm from Kittle water tank.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1120 your fix is 328°T, 1.3 nm from Kittle water tank. You steer 357°T at 5.3 kn through the water. At 1205 a new fix puts you 089°T, 2.5 nm from Tern Island tower.

   Plot the 1205 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 1030 your fix is 036°T, 2.2 nm from Westfield church spire. You steer 139°T at 6.1 kn through the water. At 1120 a new fix puts you 358°T, 2.8 nm from Mill stack.

   Plot the 1120 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  

4. At 1115 your fix is 040°T, 1.0 nm from Westfield church spire. You steer 060°T at 9.0 kn through the water. At 1145 a new fix puts you 290°T, 3.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1445 your fix is 008°T, 2.8 nm from Westfield church spire. You steer 133°T at 5.7 kn through the water. At 1520 a new fix puts you 083°T, 2.1 nm from Westfield church spire.

   Plot the 1520 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 0810 your fix is 291°T, 1.4 nm from Tern Island tower. You steer 232°T at 7.8 kn through the water. At 0850 a new fix puts you 119°T, 2.2 nm from Westfield church spire.

   Plot the 0850 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  

7. At 0945 your fix is 346°T, 2.1 nm from Tern Island tower. You steer 102°T at 4.8 kn through the water. At 1025 a new fix puts you 061°T, 2.0 nm from Tern Island tower.

   Plot the 1025 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 1320 your fix is 346°T, 2.6 nm from Tern Island tower. You steer 241°T at 7.5 kn through the water. At 1410 a new fix puts you 135°T, 1.1 nm from Westfield church spire.

   Plot the 1410 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