Are you using the Tyneside Wargames solo rules
http://tynesidewargames.co.uk/wowrules.html? The zones are identified using a 'semicircular' device, the template for which you can download from their site.
http://tynesidewargames.co.uk/download/WoWTemplateA.pdf
Once you have made the device put it around the base of your plane on the same side as the nearest enemy plane and imagine a line from your planes centre to the centre of the enemy. The sector which the line passes through is the zone you use.
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