I ran Gmaptool to get detailed map metadata and compared it to the screenshot in post #18. They are identical. And if my maps were corrupted Gmaptool would have come up with an error. Then I generated unlock code using "Jetmouse KG v1.5+5 Digits+Checksum Fix" for FID=800. Still no public transportation. And at the same time under similar circumstances FullCXNA 2014.10 MMR FID=800 works fine. The only difference I can think of is that CX NA is one .img file while CX Moscow + St Petersburg 2013.10 are two separate .img files and Nuvi combines them into a single map. So I loaded just CX Moscowand and got a single on-foot only route. Then I deleted CX Moscow and loaded CX ST Petersburg. I got two identical on-foot only routes. I guess I ran out of options.
Moscow MD5: 588AED4085BDCA4478F86E8895D279D2
St Pete MD5: 4726745FA9A3159F1372D3E932C50938