While the Floral Drive-In was located in the Los Angeles suburb of Monterey Park, the U.A. Marina Auto Movie must have been located in the Northern California coastal city of Monterey. The Floral was Monterey Park’s only drive-in, and being an inland city it certainly never had a marina. The topo map showing what you surmise might be the Marina Drive-In shows instead the location of the Edwards San Gabriel Drive-In on Valley Boulevard in the city of San Gabriel. A modern aerial view of the location would show a shopping center which has replaced the theatre.