scandi: Actually, the pilot, co-pilot, and flight engineer did not know that Cooper jumped until the plane landed in Reno at 11:00pm. If was then when the captain went to the back of plane after landing, that he noticed Cooper was gone. Hence, they didn't have a longitude and latitude. HOwever, through examining records, they were able to determine that the trim on the plane changed at 8:13pm, and because of this, and an additional experiment, they were able to prove that Cooper most likely jumped at 8:13pm.
A map of the area where they think Cooper jumped is available. However, it extends from the Columbia river to about 20 miles north to Woodland, WA, and is about 20 miles wide. Hence, it is not very useful. don't forget, this was the first time somebody committed such a crime
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However, the main focus of the search was the area around Lake Merwin