A part of the map on my GO600 has a different colour to the rest of the map. Around Research in Victoria, during the day most of the map is a pink colour but the Research part is grey. During the night most of the map is grey but the Research part is black. This change in colour is not just around Research, but starts at Research and goes on for hundreds of kms north, NE and NW. Any suggestions on fixing this will be appreciated.