Worksheet 728 · Skill 5

Set and drift

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1. At 1040 your fix is 346°T, 1.7 nm from Tern Island tower. You steer 274°T at 6.4 kn through the water. At 1115 a new fix puts you 294°T, 4.1 nm from Tern Island tower.

   Plot the 1115 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 1515 your fix is 359°T, 2.1 nm from Tern Island tower. You steer 267°T at 5.5 kn through the water. At 1630 a new fix puts you 031°T, 4.1 nm from Westfield church spire.

   Plot the 1630 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  

3. At 1050 your fix is 005°T, 1.4 nm from Westfield church spire. You steer 117°T at 4.0 kn through the water. At 1155 a new fix puts you 205°T, 2.9 nm from Tern Island tower.

   Plot the 1155 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  

4. At 1035 your fix is 056°T, 3.3 nm from Westfield church spire. You steer 085°T at 6.5 kn through the water. At 1110 a new fix puts you 306°T, 1.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1135 your fix is 356°T, 2.0 nm from Mill stack. You steer 041°T at 7.5 kn through the water. At 1205 a new fix puts you 312°T, 1.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1210 your fix is 055°T, 3.5 nm from Westfield church spire. You steer 135°T at 7.9 kn through the water. At 1245 a new fix puts you 192°T, 1.7 nm from Tern Island tower.

   Plot the 1245 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  

7. At 1320 your fix is 115°T, 2.3 nm from Westfield church spire. You steer 106°T at 6.2 kn through the water. At 1430 a new fix puts you 235°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1430 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0925 your fix is 015°T, 1.6 nm from Tern Island tower. You steer 248°T at 4.3 kn through the water. At 1000 a new fix puts you 278°T, 2.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn