How do I set a map marker to my location on the map?

I made a map/sprite that is set visible when I press M. Then I created a second sprite that I want to move to my location relative to the map. The layout size is 100000x100000 and the map/sprite size is 1000x1000.

I would appreciate any help thank you!

Create a smaller map and a character that moves at a portion of the speed.

Check this out:

youtu.be/EF0dZNrdlAw