
Passing through the Bayview area is 3rd Street and close by is Highway 101, two possible routes Paul Stine may have traveled on his return back from San Francisco International Airport after dropping off his final paying fare and returning back to the San Francisco theater district. The Bayview-Hunters Point region has a colorful history and has been the scene of much controversy and conflict down the years.
After a San Francisco ordinance in 1868 banned the slaughter and processing of animals within the city proper, a group of butchers established a "butchers reservation" on 81-acre of tidal marshland in the Bayview district. Within ten years, 18 slaughterhouses were located in the area along with their associated production facilities for tanning, fertilizer, wool and tallow. The "reservation" (then bounded by present-day Ingalls Street, Third Street, from Islais Creek to Bayshore) and the surrounding houses and businesses became known as Butchertown. The butcher industry declined following the 1906 San Francisco earthquake until 1971 when the final slaughterhouse closed.
Taken from Wikipedia
If we insert a Zodiac timeline to this, the final slaughterhouse closed in 1971, the year the Zodiac mailed us his second to last confirmed correspondence on March 13th 1971, before he went on sabbatical for close to three years, although not suggested, the irony cannot be ignored. Also from our experience the undeniable suggestion the Zodiac Killer may have served in the military or have naval connections has been a constant. The Zodiac timeline is not certain, on account of earlier murders that may or may not be attributed to him, such as the Riverside murder of Cheri Jo Bates on October 30th 1966, nevertheless this is where we will start.

The Long Beach Naval Shipyard, which closed in 1997, was located at Terminal Island between the city of Long Beach and the San Pedro district of Los Angeles and approximately 23 miles south of the Los Angeles International Airport. It was situated 1 hr 20 minutes drive west of Riverside. The Mare Island Naval Shipyard is located in Vallejo, the hot zone highlighted by Kim Rossmo, when using the art of geographical profiling to zoom in on a possible home location of the Zodiac Killer. And finally the Hunters-Point Naval Shipyard, San Francisco, located on 638 acres in the southeast corner of the city. At the start of World War II the Navy recognized the need for greatly increased naval shipbuilding and repair facilities in the San Francisco Bay Area, and in 1940 acquired the property from the private owners, naming it Hunters Point Naval Shipyard. The property became one of the major shipyards of the west coast. It was later renamed Treasure Island Naval Station Hunters Point Annex. During the 1940's, many workers moved into the area to work at this shipyard and other wartime related industries.
The key fissile components of the first atomic bomb were loaded onto the USS Indianapolis in July 1945 at Hunters Point for transfer to Tinian. After World War II and until 1969, the Hunters Point shipyard was the site of the Naval Radiological Defense Laboratory, the US military's largest facility for applied nuclear research. The yard was used after the war to decontaminate ships from Operation Crossroads. Because of all the testing, there is widespread radiological contamination of the site. After the war, with an influx of blue collar industry, the area remained a naval base and commercial shipyard. The Navy operated the yard until 1974, when it leased most of it to a commercial ship repair company. Extract from Wikipedia.
The Navy ceased operations in 1974, the year the Zodiac mailed his final confirmed letter, the Exorcist Letter on January 29th 1974, in fact three further potential Zodiac letters were mailed that year, before the Zodiac Killer finally disappeared for good.

The question remains, was irony his intention, if he had indeed selected Hunters Point as a location, somewhere he may have been familiar with or even worked. Even the surrounding areas were once known as 'Butchertown'.
In fact a bombing did occur in the January of 1970 at Hunters Point Police Station, highlighted in this KPIX eyewitness report and although with near certainty not the Zodiac Killer, it is possibly something he may have been aware of, had he worked in this region of San Francisco.
Did the Zodiac Killer live and work in San Francisco during the majority of his crimes, placing distance between himself and the first three attacks, before coming home to roost or did he live across the bay in the Vallejo/Benicia area and only used San Francisco as a mailing point for the most part. Who knows for sure.
But the 246 degrees from the center point of Mount Diablo runs directly across the Hunters-Point Naval Shipyard, in the Bayview District, notwithstanding the accuracy of the Little List diagram and the Mare Island Naval Shipyard has always courted some attention in Zodiac circles, on account of the proposed naval connection to our killer. Did he work at both facilities or even the third at Riverside. Was irony at work here or is the Hunters-Point connection just simply wide of the mark once more.
SEE PART THREE - http://www.zodiacciphers.com/zodiac-news/sfi-airport-hunters-point-part-three