title: Creating a Google maps custom overlay/tiles over several zoom levels
body: <p>I want to add a custom overlay (a png) in the middle of the ocean. This is fine for high to medium zoom levels, but at lower zoom levels Google maps doesnt have any imagaery for the tiles.</p>
  
  <p>I want to be able to overlay these data-less tiles with images of the sea, but i am aware that using one huge png is bad practice, so I'd like to be able to create several tiles and piece them together over all zoom levels.</p>
  
  <p>Does anyone have any info on the best way to do this?</p>
  
  <p>Thanks</p>