Adding my GPS device to the Lovelace map card?

I have an ESPHOME device that sends Lat/Long information to my Home Assistant every few seconds.

What is the next step I need to undertake, to allow that information to display as an icon on the Map Card?

I see the entity “zone.home” (which does display) as a state and 8 attributes. However, my Lat & long entities as a much simpler structure of just state & 2 attributes.

How do I turn the two lat/long sensors into a zone?

Regards, Martin

Solution is here:
one
two