STEPS TO FIND THE OFF-TRACK ETP
1. Find the halfway point on a line that connects the two stated alternates. This point is known as position X
2.Draw a line from position X found in step 1, up to your flight planned track. This line must be at 90 degrees to the line that connects the two alternates. This position is the Equi-distant pint between the two alternates- and is known as position A
3.From position A found in step 2, measure the scale distance to either of the two alternates
4. To find the length of the wind vector line divide the distance found in step 3 by the TAS and multiply by wind speed given in the question
5.With your protractor centred on position X, mark the direction from which the wind is blowing
6. Now draw a pencil line from position X up to the mark found in step five. This is the wind vector line
7. Measure up the wind vector line the scale distance found in step four. This is position Y
8. Finally, draw a line from position Y up to your flightplanned trackline. This line must pass through the line connecting the two alternates at 90 degrees. You have found the ETP. position B