The only 3 I know.
Kriegsmarine Chart Colour MOd
http://www.subsim.com/radioroom/down...?do=file&id=86
US Chart Colour MOD
http://www.subsim.com/radioroom/down...?do=file&id=87
Nav Map make over with Air Bases
http://www.subsim.com/radioroom/down...o=file&id=1900
This sounds more like what you're looking for. Was once Nav make over,but now add's Airbases, you'll see flags for US and JP airbases and they change as bases change, has greens, browns, blues, ect.