Cursor and markers
In Surfer, the cursor is the vertical line that can be positioned by clicking the primary mouse button. The cursor will snap to a nearby transition if there is a waveform below.
There are also numbered markers. These are created from the cursor location, either by right-clicking and selecting New (or a number to redefine an existing), or by pressing Ctrl+0-9 (Cmd+0-9 on MacOS).
Although only marker 0 to 9 can be directly accessed using keyboard commands, there is support for up to 255 markers, numbered
It is possible to center on a marker by pressing 0-9.
The number shown in the column usually showing variable values of waveforms is the difference in time to the current cursor location.
Cursor and marker window
By pressing space and typing show_marker_window
a rudimentary window showing differences between all defined markers and the cursor (primary) is shown. It is possible to center a marker/cursor by pressing on the name of the marker/cursor.