Instrument Cluster/ Infotainment Screen (Navigation)

I've had my Seal U-DMi a few weeks now & am pretty comfortable around most of the settings now. The one I can't seem to address - and it's because I don't think you can - is the Day/ Night setting. I really like the Instrument Cluster to be black ie in night setting. However, I like the Navigation to be in Day as the black map is difficult to follow. It appears to me that there's no way of separating the two. Either both are day, both are night, or it's in auto between to two. Am I wrong? Is there any way to set the Navigation to day & keep the instrument cluster black? TIA