'QUOTE: If you do the maths, a complete 180 degree horizontal and 30 degree vertical scan using this method could take at least 54 seconds. US military research found that it takes a pilot 12.5 seconds to avoid a collision after target detection. There can the'
also the above paragraph referring to 180 degree implies a forwards scan - you should also be aware of merging traffic from behind - they might not see you ............................. it pays to have a looksee behind as well sometimes