Basic Plus and Pro Plus subscribers can see their GPS position on the taxi diagrams that appears when zooming into an airport while using the Aeronautical map view. A "Pro" level plan is required to see your GPS position on an official standalone taxi diagram. A "Pro Plus" level plan is needed to view your GPS position on both Aeronautical map taxi diagrams and standalone taxi diagrams.
Image 1. Zooming into an airport will cause the airport layout to be displayed.
Image 2. Zooming in further will reveal additional labels, such as taxiway designators.