Since FIF has rainfall radar, you can use tile map servers.
So if you replace meteo tile server, you can get for example Google maps.
There are folder in FIF main folder, called Maps/WeatherTileServers. If you copy txt file with information about tile server, you can use it.
For example Google.txt file looks like this:
updateTime=0 // seconds
updateDelay=0 // seconds, application first try to update when needed (UpdateTime) +TimeDelay
minZoom=4
maxZoom=16
resolution=high // high, medium, low, veryLow
cacheEnabled=true
url=http://mt0.google.com/vt/lyrs=y&hl=en&x={x}&y={y}&z={z}&s=Ga