ODG Glasses are not currently Google Approved Android devices, which means they do not have the Google components or Apps like Playstore, and may not use Google Mobile Services.
There are many other service providers and Apps that may be licensed separately. Here are just a few random maps providers:
- Here Maps - https://developer.here.com/develop/mobile-sdks
- Nutiteq - http://www.nutiteq.com/nutiteq-sdk/overview/
- OSMDroid - https://github.com/osmdroid/osmdroid
Some provide plug-ins for Unity, or SDKs for Native Android App use.
For Voice services, there are also many alternatives. See this article for some examples: