Thread: Change the Map Color?

After some more testing I decided to add some nonNT polygons with colors to check how the map is drawn in Mapsource (and basecamp)
I added:
- DATA BOUNDS 0x4b as BLACK
- LAKE _GT_1000MI 0x42 as RED
- OCEAN 0x28 as GREEN
- OCEAN_(NT) 0x10b01 as PURPLE
- TOWN_(NT) 0x10802 as YELLOW

From zoom 3000km up to 70km Mapsource draw the map using nonNT colors.
It started using NT colors from zoom 50km and on.
Basecamp did the same but at different zoom levels.
Detail level is always at Highest.
As we can see, the Ocean_(NT) polygon covers just the sea area from the shoreline to the limits of the map tile.
From there on, Mapsource draws the nonNT Ocean polygon.
From zoom 50km and on, all the land that is not inside a map tile is drawn as black nonNT Data Bound (nonNT map Background)

Spoiler:

But things are different when I send this map to Nuvi 3490...
The zoom threshold is now at 20km, up to that zoom level everything is drawn as 3490's World Basemap.
The images on the left side are those with the TYP with colored polygons.
3490 totally ignores nonNT polygons and draws the map area outside the map tiles with 3490's World Basemap colors.
The islands outside map tiles that were black in Mapsource, now they have the color of the World Basemap, so has the sea.
The images on the right side are from a map with a TYP that doesn't include any nonNT polygon and in the Draw Order there are no entries for nonNT polygons (only NT polygons).
We can see that the land and sea inside the map tiles is drawn according to the colors of NT polygons, while the land and sea outside are drawn according to the World Basemap colors.

Spoiler:

So in Mapsource/Basecamp we need some nonNT polygons in the Draw Order, but this does not affect Nuvi 3490, with or without nonNT polygons, the result on 3490 is the same.