You can create an instant navigation menu by typing 0:00 followed by a title in your video description.
It sounds like you're referring to a specific update or a "Version 2.60" for a time-stamping tool. While there isn't one universal piece of software with that exact name, a "solid feature" typically expected in a 2.60-style update for a timestamping app would be . The "Solid Feature": Dynamic Metadata Overlays Time Stamp 2.60
To send someone to a specific moment in a video, add &t=140s (for 2 minutes and 20 seconds) to the end of a YouTube link. You can create an instant navigation menu by