Worksheet 99 · Skill 5

Set and drift

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1. At 1140 your fix is 011°T, 1.0 nm from Kittle water tank. You steer 300°T at 4.4 kn through the water. At 1225 a new fix puts you 206°T, 2.4 nm from Tern Island tower.

   Plot the 1225 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  

2. At 0920 your fix is 057°T, 2.8 nm from Tern Island tower. You steer 141°T at 4.6 kn through the water. At 1000 a new fix puts you 039°T, 3.5 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1600 your fix is 334°T, 2.3 nm from Mill stack. You steer 327°T at 5.7 kn through the water. At 1655 a new fix puts you 052°T, 1.5 nm from Westfield church spire.

   Plot the 1655 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  

4. At 0735 your fix is 053°T, 3.5 nm from Tern Island tower. You steer 267°T at 6.2 kn through the water. At 0900 a new fix puts you 313°T, 3.5 nm from Tern Island tower.

   Plot the 0900 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1230 your fix is 310°T, 2.3 nm from Tern Island tower. You steer 205°T at 4.2 kn through the water. At 1320 a new fix puts you 233°T, 2.1 nm from Tern Island tower.

   Plot the 1320 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 1205 your fix is 034°T, 2.5 nm from Kittle water tank. You steer 006°T at 5.4 kn through the water. At 1240 a new fix puts you 056°T, 2.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0940 your fix is 015°T, 2.5 nm from Mill stack. You steer 043°T at 8.4 kn through the water. At 1020 a new fix puts you 076°T, 2.9 nm from Tern Island tower.

   Plot the 1020 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 1340 your fix is 060°T, 3.4 nm from Heron Point Light. You steer 066°T at 4.4 kn through the water. At 1500 a new fix puts you 150°T, 0.9 nm from Gannet Rock daybeacon.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn