I developed a learning project for the Adafruit Pyportal. This has been collecting dust on my desk since I received my Adabox.
My initial attempt was to use the Google Map API to generate a downloadable map with the ISS location as the center. This was not successful as it seems the Adafuit.io image converter does not support generated maps.
My second attempt was to use a downloaded Mercator projection image of the Earth and display the current location of the ISS.
I found lat-long to Mercator project code here.
I look up the location of the ISS here.
I found the map from here.
* The lat-long to x-y conversion is not perfect. I may add a fudge factor or change my path.
The code and source BMP file are published in my github page. It should be in the links section of this web area.