I am evaluating Google map for my MW DX logging. The map below shows a distribution of received MW stations of U.S. on TDXC DXpedtion conducted at a coastline of Chiba prefecture in Japan on Sep.22,2016. With your mouse, you can freely click each orange dot to see the reception sound link for each received station and You can also see the distribution of the stations. You can move the map freely too. Most of the received stations are located close to west coast.
I am wondering why I couldn't receive more inland MW stations. I guess this result is related to sea gain effect at transmitting site.