I noticed that Facebook is using Here Maps on their location pages? Is that new? Check out this example: https://www.facebook.com/JWMarri...

HERE is a leader in navigation, mapping and location experiences. We build high-definition (HD) maps and combine them with cloud technology to help you and your business navigate a complex world with personalized solutions. Anytime, everywhere, across a broad range of devices, operating systems and vehicles. Offline mode supported. For more: https://company.here.com/here/

I've found the offline maps useful while travelling. Unfortunately it's not available everywhere, it would be great to have offline maps for Japan and Korea.