Figure 24 
(Refer to figure 24.) Determine the heading for a flight from 
Allendale County Airport (area 1) to Claxton-Evans County Airport 
(area 2). The wind is from 090° at 16 knots and the true airspeed is 
90 knots. 





   ANSWER: 208°. 
   
      This flight is from Allendale County (above 1) to 
      Claxton-Evans County Airport (left of 2) on Fig. 24.
      TC = 212°.
      MC = 212° TC + 5°W variation = 217°.
      Wind magnetic = 090° + 5°W variation = 095°.
      Mark up 16 kt. with 095° under true index.
      Place MC 217° under true index.
      Move wind mark to 90 kt. TAS arc.
      Note the pencil mark is 9° left.
      Subtract 9° from 217° MC for 208° MH.

Figure 24 Figure 59 
(Refer to figure 24 and figure 59.) Determine the compass heading 
for a flight from Claxton-Evans County Airport (area 2) to Hampton 
Varnville Airport (area 1). The wind is from 280° at 8 knots, and the 
true airspeed is 85 knots. 





   ANSWER: 042°. 

   1. This flight is from Claxton-Evans (left of 2) to Hampton 
   Varnville (right of 1) on Fig. 24.

   2. TC = 045°.

   3. MC = 045° TC + 5°W variation = 050°.

   4. Wind magnetic = 280° + 5°W variation = 285°.

   5. Mark up 8 kt. with 285° under true index.

   6. Place MC 050° under true index.

   7. Move wind mark to 85 kt. TAS arc.

   8. Note the pencil mark is 5° left.

   9. Subtract 5° from 050° MC for 045° MH.

   10. Subtract 3° compass variation (obtained from Fig. 59) 
   from 045° to find the compass heading of 042°. 

Figure 22 
(Refer to figure 22.) What is the estimated time en route from 
Mercer County Regional Airport (area 3) to Minot International 
(area 1)? The wind is from 330° at 25 knots and the true airspeed is 
100 knots. Add 3-1/2 minutes for departure and climb-out. 





   ANSWER: 48 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   Using Fig. 22, the time en route from Mercer Co. Reg. Airport 
   (lower left corner) to Minot (right of 1) is determined by 
   measuring the distance (60 NM measured with a plotter), 
   determining the time based on groundspeed, and adding 3.5 
   min. for takeoff and climb. The TC is 012° as measured with a 
   plotter. The wind is from 330° at 25 kt.

   On the wind side of your flight computer, place the wind 
   direction 330° under the true index and mark 25 kt. up. Rotate 
   TC of 012° under the true index. Slide the grid so the pencil 
   mark is on the arc for TAS of 100 kt. Read 80 kt. 
   groundspeed under the grommet.

   Turn to the calculator side and place the groundspeed of 80 
   kt. on the outer scale over 60 min. Find 60 NM on outer scale 
   and note 45 min. on the inner scale. Add 3.5 min. to 45 min. 
   for climb for en route time of approximately 48 min. 

Figure 23 
(Refer to figure 23.) Determine the estimated time en route for a 
flight from Priest River Airport (area 1) to Shoshone County 
Airport (area 3). The wind is from 030 at 12 knots and the true 
airspeed is 95 knots. Add 2 minutes for climb-out. 





   ANSWER: 31 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   1. To find the en route time from Priest River (upper left 
   corner) to Shoshone County (southwest of 3), use Fig. 23.

   2. Measure the distance with plotter to be 49 NM.

   3. TC = 143°.

   4. Mark up 12 kt. with 030° under true index.

   5. Put TC of 143° under true index.

   6. Slide the grid so the pencil mark is on TAS of 95 kt.

   7. Read the groundspeed of 99 kt. under the grommet.

   8. On the calculator side, place 99 kt. on the outer scale over 
   60 min.

   9. Read 29-1/2 min. on the inner scale below 49 NM on the 
   outer scale.

   10. Add 2 min. for climb-out and the en route time is 
   approximately 31 min. 

Figure 23 
(Refer to figure 23.) What is the estimated time en route from 
Sandpoint Airport (area 1) to St. Maries Airport (area 4)? The wind 
is from 215° at 25 knots, and the true airspeed is 125 knots. 





   ANSWER: 34 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

      You are to find the time en route from Sandpoint 
      Airport (north of 1) to St. Maries Airport (southeast 
      of 4) on Fig. 23.
      Measure the distance with plotter to be 59 NM.
      TC = 181°.
      Mark up 25 kt. with 215° under true index.
      Put TC of 181° under true index.
      Slide the grid so pencil mark is on TAS of 125 kt.
      Read groundspeed of 104 kt. under the grommet.
      On the calculator side, place 104 kt. on the outer scale 
      over 60 min.
      Find 59 NM on the outer scale and read 34 min. on the 
      inner scale.

Figure 23 
(Refer to figure 23.) What is the estimated time en route for a flight 
from St. Maries Airport (area 4) to Priest River Airport (area 1)? The 
wind is from 300° at 14 knots and the true airspeed is 90 knots. Add 
3 minutes for climb-out. 





   ANSWER: 43 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   1. Time en route from St. Maries Airport (southeast of 4) to 
   Priest River Airport (upper left corner) on Fig. 23.

   2. Measure the distance with plotter to be 54 NM.

   3. TC = 346°.

   4. Mark up 14 kt. with 300° under true index.

   5. Put TC of 346° under true index.

   6. Slide the grid so pencil mark is on TAS of 90 kt.

   7. Read groundspeed of 80 kt. under the grommet.

   8. On the calculator side, place 80 kt. on the outer scale over 
   60 min.

   9. Find 54 NM on the outer scale and read 40 min. on the 
   inner scale.

   10. Add 3 min. for climb-out to get time en route of 43 min. 

Figure 24 
(Refer to figure 24.) What is the estimated time en route for a flight 
from Claxton-Evans County Airport (area 2) to Hampton Varnville 
Airport (area 1)? The wind is from 290° at 18 knots and the true 
airspeed is 85 knots. Add 2 minutes for climb-out. 





   ANSWER: 39 minutes. 

   The distance en route from 
   Claxton-Evans (southwest of 2) to Hampton Varnville (east 
   of 1 on Fig. 24) is approximately 57 NM. Also use your 
   plotter to determine that the TC is 45°. The requirement is 
   time en route and not magnetic heading, so there is no need 
   to convert TC to MC.

   Using the wind side of your computer, turn your true index 
   to the wind direction of 290° and mark 18 kt. above the 
   grommet with your pencil. Then turn the inner scale so that 
   the true index is above the TC of 45°. Place the pencil mark 
   on the TAS of 85 kt. and note the groundspeed of 91 kt. 
   Turn your flight computer over and set the speed of 91 kt. 
   above the 60-min. index on the inner scale. Then find the 
   distance of 57 NM on the outer scale to determine a time en 
   route of 37 min. Add 2 min. for climb-out, and the en route 
   time is 39 min. 

Figure 24 
(Refer to figure 24.) What is the estimated time en route for a flight 
from Allendale County Airport (area 1) to Claxton-Evans County 
Airport (area 2)? The wind is from 100° at 18 knots and the true 
airspeed is 115 knots. Add 2 minutes for climb-out. 





   ANSWER: 30 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   1. To find the en route time from Allendale County 
   (northeast of 1) to Claxton-Evans (southeast of 2), use Fig. 
   24.

   2. Measure the distance with plotter to be 55 NM.

   3. TC = 212°.

   4. Mark up 18 kt. with 100° under true index.

   5. Put TC of 212° under true index.

   6. Slide the grid so the pencil mark is on TAS of 115 kt.

   7. Read groundspeed of 120 kt. under the grommet.

   8. On the calculator side, place 120 kt. on the outer scale 
   over 60 min.

   9. Read 28 min. on the inner scale below 55 NM on the outer 
   scale.

   10. Add 2 min. for climb-out and the en route time is 30 min. 

Figure 26 
(Refer to figure 26.) What is the estimated time en route for a flight 
from Denton Muni (area 1) to Addison (area 2)? The wind is from 
200° at 20 knots, the true airspeed is 110 knots, and the magnetic 
variation is 7° east. 





   ANSWER: 13 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   1. To find the en route time from Denton Muni (southwest of 
   1) to Addison (southwest of 2), use Fig. 26.

   2. Measure the distance with plotter to be 23 NM.

   3. TC = 128°.

   4. Mark up 20 kt. with 200° under true index.

   5. Put TC of 128° under true index.

   6. Slide the grid so the pencil mark is on TAS of 110 kt.

   7. Read groundspeed of 102 kt. under the grommet.

   8. On the calculator side, place 102 kt. on the outer scale 
   over 60 min.

   9. Read 13 min. on the inner scale below 23 NM on the outer 
   scale. 

Figure 26 
(Refer to figure 26.) Estimate the time en route from Addison (area 
2) to Redbird (area 3). The wind is from 300° at 15 knots, the true 
airspeed is 120 knots, and the magnetic variation is 7° east. 





   ANSWER: 8 minutes. 

   The requirement is time en route and 
   not magnetic heading, so there is no need to convert TC to 
   MC.

   1. To find the en route time from Addison (southwest of 2) 
   to Redbird (above 3), use Fig. 26.

   2. Measure the distance with plotter to be 18 NM.

   3. TC = 186°.

   4. Mark up 15 kt. with 300° under true index.

   5. Put TC of 186° under true index.

   6. Slide the grid so the pencil mark is on TAS of 120 kt.

   7. Read groundspeed of 125 kt. under the grommet.

   8. On the calculator side, place 125 kt. on the outer scale 
   over 60 min.

   9. Read 8.5 min. on the inner scale below 18 NM on the outer 
   scale. 

Figure 21 
(Refer to figure 21.) What is your approximate position on low 
altitude airway Victor 1, southwest of Norfolk (area 1), if the VOR 
receiver indicates you are on the 340° radial of Elizabeth City VOR 
(area 3)? 





   ANSWER: 18 nautical miles from Norfolk VORTAC. 

   First find V1 extending SW on the 
   233° radial from Norfolk VORTAC on Fig. 21. The V1 label 
   appears just above 2. Then, draw along the 340° radial from 
   Elizabeth City VOR (southwest of 3). If you are confused 
   where the exact VOR is (center of compass rose), draw a line 
   through the entire compass rose so your line coincides with 
   both your radial (here 340°) and its reciprocal (here 160°). 
   Note that the intersection with V1 is 18 NM from the Norfolk 
   VORTAC. 

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