you will have to break it down a bit further than that. each hotspot is the rectanular size of the image supplied... and you cannot have multiple hotspots on one image.
if you use a back ground image (or button "type = static") to create the F15 radar, then place treansparent GIFs or PNG files over the locations you want to be buttons/hotspots, that would work. dont forget that with v1.0.2 you can now place buttons on layers, so you can arrange your buttons in the correct order.
This is rugg's WIP from a while back, and the buttons/hotspots have been highlighted in red
