NorthStar 961 Reference Manual page 211

Creating a track
using the start
saving key
961/962 Operations and Reference Manual, Rev. A
8. To mark the track for display on the CHART screen, press
the ON CHART key.
With this method, you can immediately start saving position
data to a new track, then stop saving data with the press of a
key (you can only save to one track at a time).
To create a new track at the TRACKS screen:
1. At the TRACKS screen, press the START SAVING key.
A field for the new track appears on the screen.
The START field is set to the present, and the END field is
dashed-out, which means that position data is now being
saved to this track. In the DESCRIPTION field (not
labelled) at the bottom of the screen, the system tells you
that data is being saved to a new track, and updates this
new track's number of positions and range of minutes and
seconds, or hours and days, every five seconds.
Chapter 9 - Creating Tracks
Start saving track screen
Page 9-9