Here's how I'd do it personally:
- Pick your starting point and diversion point. Draw a line on your map, marking the half way point.
- Make a best guess for a wind-corrected heading and note the time.
- Use the DP-1 plotter to calculate the distance and refine the wind-corrected heading. You can also use this to estimate the arrival time.
- Refine your heading/ETA at the half way point as per usual.
Nice and simple
