Gmaps view not displaying related nodes

Overview
I'm unable to create a node view, with GMap format, where the location content is within a related node.

Structure
Content Type A
Field A1 - Text
Field A2 - Entity reference ->(Field B1 shown below)

Content Type B
Field B1 - Text
Field B2 - Location

Summary of Previous Efforts

• View 1: Node view of just Content Type B - GMaps works great.
• View 2: Node view of Content Type A with with relationships to Content Type B, in table format - All fields are displayed as expected.
• View 2: Changed to GMap format - GMap does not display.
• View 2: I added latitude and longitude fields to the view with appropriate relations, change the data source field to "Choose latitude and longitude fields", select the new fields, see the content displayed correctly in a table format, but going to a GMap format does not work.

Inquiry
Is this an issue with D7 or am I missing an important aspect of the configuration?

Thanks so much.