I look for marinas with maps so i can do exactly that but a LARGE portion of them just don't have them uploaded for whatever reason. If you come across a marina website (or any site) that has a good slip diagram on it, please forward me the link so I can download it directly. If you do send ,e a map or a link, please include any websites that you'd like me to add under your name on the Contributing Mariner's page of the site. I like to add links to blogs, websites, etc. under the contributor's names to encourage boaters to send maps, etc.
Fair winds!