So I have the chart plotter now, and I have to say homeport is not much of an emulator. The original TOPO map opens up just the same on the chart plotter as the TRE converted maps (not so in homeport) and there appears to be no difference in map display what so ever. The only difference seems to be in functionality: the converted maps let you access the Bluechart Vision options, such as the 3D navigation and 'fish eye view' while the original TOPO does not allow these options. I'm guessing the operation of these features is going to be quite limited because the map lacks bathymetric data, but maybe with the depth sounder connected... I will update once I have these maps out on the water to see how they work in real application, but I'm happy that the TOPO will display on this plotter, because the factory installed world basemap is pretty much useless.