Source mod timing and position information Thread

Hey all. I've created a HL2-EP2 mod for a research project (let me mention now that I know next to nothing about programming). In the game, the player is placed in an environment with 4 landmarks. They start at landmark A and are instructed to find B, then C, then D, then back to A, and they keep going from place to place until all 12 permutations of landmark pair routes have been traversed. At each landmark, walking into a trigger_once brush entity signifies being at that landmark. I was wondering if it is possible to record the time and path that the player takes between each landmark. I know the information is there somewhere in the game as it has to keep track of x,y coordinates and time, but I don't know how to get to it. Can anyone help? Thanks.