I've been able to mark laps by position on courses I ride on, but what I'd like to do is set a marker on a course so that I can track my performance during certain sections of the course.
There are a couple of routes in my neighborhood I ride regularly so this feature/setting would help me track my performance. I'm not running laps per se, just sections with fixed start points and end points.
Ie, if I were riding South in Manhattan from 125th Street, I'd like to see how fast I get to 106th, then 96th, then 86th each time I ride this course.