Hint
If you use the off when needed version, hold the radar type key (Alt or Dpad down) to show the minimap again.
If you use the always OFF version, choose to always hide the HUD to activate the cores (otherwise they will not show up).

Installation
Put the file in your RDR2 directory.

Recommended mods to use in addition
Realistic Navigation by alfabravozapa

Special thanks to Bolmin for giving me the native function and the hash.