CVLGrid - RK/RM option?

what is “RK/RM Options”?RM/RM???
K-001.jpg

This refers to labels for River Kilometer/River Mile (RK/RM) on a polyline. You can see more information in the Knowledge Base link below:https://eemodelingsystem.atlassian.net/wiki/spaces/CVLKB/pages/2818168/Overlay+Operations