I have seen this option to enable HD map layer on the remote for my T30, but cannot find any information on how to use this. I have a P4M that i use to gather field imagery. Is there a way to use the photo maps I make with my P4M and Terra on my T30 remote?

Hi there! I do have the same question!
I have noticed that if you upload your planning from DJI terra through SD card you will be able do see the orthomosaic as a basemap for your spraying but it is size its massive for the RC to handle so you would not be able to charge many of those at time without getting free space at the RC.
Other than that I was not able to just load an orthomosaic to fly a manual route mission, it just works for traditional maps.

is there a way to set a URL like mapbox, google maps or whatever service that override the map? After the last updates the basemap stopped updating.