500ths
Unit of measurement used by the game. Represents 1/500 of an inch.
Boundary
Refers to walls at each Section. Boundary 0 is the rightmost wall, and increments going towards the left.
DLAT
Position to the left or right of the track centerline (negative is to the right, positive is to the left)
DLONG
Position along the track centerline (i.e. distance traveled from the start/finish line, where start/finish line = 0)
Fsect
Also known as feature section. Each Section can have up to 10 Fsects, each Fsect can be a wall or the right-side edge of a surface. The Fsect is defined by two DLATs at the beginning and end of a track Section.
Mark
Refers to wall textures besides the default texture applied by TRK23D. Typically used to apply advertising textures to walls, based on a text file called <track>.MRK.
Section
Either a line or a constant radius curve that makes up a section of a track. Sections are numbered starting from 0.
TSD
Also known as track surface detail. Refers to lines or textures drawn in or imported by OPE. Typically used to create roadway markings and skid marks.
Xsect
Also known as cross section. Each track has up to 10 Xsects which defines the elevation at a given DLAT. Each Section can have different elevations at each Xsect.