Ideally the best place to read mirage would be 1/2 to 2/3 of the distance to the target. If the heat waves are rising straight up, we say the mirage is boiling and the wind is either not blowing at all or is blowing straight at the spotting scope (head winds from 12 o clock or tail winds from 6 o clock).e have all seen mirage while driving on a hot day in the form of the heat waves coming off of a black-topped road. Wind moves these waves the harder the wind is blowing the faster the waves (mirage) will move.