This has been superseded by the instructions here : https://www.matrixgames.com/forums/viewtopic.php?f=10201&t=381973&p=4980384#p4980384 as GMAPS is not really available.
Out of the box CMANO uses a map set known as SRTM 30 Plus. This is an open repository from the USGS with tiled data from across the globe. It’s great for CMANO on a macro scale, but what if we want to get right in and see individual target points? What if we want to do it on existing campaign scenarios? Luckily it’s not too hard! A caveat, this won’t work for the standalone versions, you need the full version of CMANO with the editor.