I have looked many places on the app to determine what the different colors mean: black, red, blue, etc., and cannot find the information. Please let me know what the colors mean.

Hi there

There is a key under the map on the website version but i can see now that it is not very clear.
The meaning of the colours are

Red : Excellent
Blue : Good
Purple : Other recommended

Thanks for using BBR

All the best

David