Showing your player location on the map in Ark Survival Evolved is not turned on by default in the Single Player Options. It is as simple as checking a box. Unfortunately on servers, it is an option not always selected by the owner of the server. Without the player map pointer, the game is much harder when starting out on a new map, or a large map.
|The player location shows up as a blue triangle.
To turn on player map location in single player:
PC - Scroll down the general tab in the single-player options menu and just check the SHOW MAP PLAYER LOCATION box.