Thermo Scientific Apreo User's Operation Manual page 133

Scan Rotation (Shift + F12)
The Scan menu / Scan Rotation function activates the onscreen
tool to rotate the scan and align the image. Because it is solely a
functionality of the electronic optics, it has no effect on stage
movements. It is used to orient the image relative to mechanical
rotation and detector direction.
Clicking on the Scan menu / Scan Rotation places a green circle in
the image window. The green triangle on its perimeter denotes,
by its position, the sample rotation relative to its original position
when mounted on the stage. Initially, this is in the 12 o'clock
position. Click on & drag it around the circle perimeter to choose
a new sample rotation.
The readouts shown at the image window bottom provide
information about the Actual Rotation (original position) and the
Target Rotation (the selected position).
Clicking on the written angles around the circle perimeter (0° /
90° / 180° / 270°) or the perimeter anywhere drives the stage to
that rotation position and the green triangle updates onscreen.
Clicking on the framed + / – sign increases / decreases the
rotation angel by an incremental value.
C O N F I D E N T I A L – limited rights
Revision A Feb 2018
Operating Procedures: Stage Control
User Manual 5-35