This image depicts the Great Circle Route from the Alameda Naval Air Station (NGZ) to Honolulu International Airport. In actuality, the S-42 taxied on San Francisco Bay before taking off, then flew west over the Golden Gate Bridge before turning on its course to Hawaii. It arrived overhead Diamond Head on the island of Oahu before landing on the waters of Pearl Harbor. The actual distance flown is there ore an approximation. (Great Circle Mapper)