There are 3 modlets :

OnScreenDisplay_Zombies <-- tracks zombies   REPLACED by OnScreenDisplay_Entities <----tracks nearby zombies and animals.
OnScreenDisplay_Landmarks <--- tracks nearby trader physical location and saved waypoints.
OnScreenDisplay_PlayerOwned <--- tracks player owned properties.

Max Track Distances ( values are as entered in the configs...actual mileage may vary since entities (zombies, traders) spawn when the player is at a certain proximity) :

OnScreenDisplay_Landmarks
Waypoints (compass) : max distance= -1 (infinite)
Waypoints (screen) : active = -1, inactive = 300m
Trader (compass) : max distance= 3000 (actual distance around 160-200m) <different icon for each trader>
Trader (screen) : max distance= 500m  (actual distance around 160-200m)   <different icon for each trader>

NOTE: Trader tracking might be removed in future updates.  <Since A21 The game automatically creates and labels a landmark on first visit.> 

OnScreenDisplay_PlayerOwned
Spawn/Bedroll  (compass/screen) : max distance= -1 <custom icon> 
Base/Land Claim Block (compass/screen) : max distance= -1   <custom icon> 
Bicycle/Turrets etc. (compass/screen)  (actual distance around 160-200m)  <Since A19.5 moving away far enough turns the bicycle into a landmark>


OnScreenDisplay_Entities
On map  : max distance= -1  (actual distance around 160-200m) ,  <custom icons for most animals and zombies>
On compass  : max distance= 100m ,  <custom icons for most animals and zombies>
On screen  : max distance= 30m ,<same custom icon for all zombies, different custom icon for all animals>

Icon colours:   Cyan= Timid Animal, Red=Normal Enemy, Yellow=Feral Enemy, Green=Irradiated Enemy, Purple= Boss / Legendary/ Special Enemy