GoTo's and Mount flip
A GEM mount operates with the scope either on the west side of the mount or the east side. When you initiate a GOTO for an object east of the meridian, the mount will slew to the object with the counter-
weights in the “down” position with the scope/camera on the west side of the mount. If you then initiate a slew to an object west of the meridian, the mount will reverse its position or “flip” so that the scope/camera is on the east side of the mount.
In the normal scheme of things a “flip” only occurs for GOTO's/slews as described above. If you select an object east of the meridian and the object crosses the meridian, the mount will not flip and will continue to track the object. With this situation, the mount will end up in the counter-weights up position. It also poses collision risks that are potentially different from the counter-weights down position so close monitoring of mount movements is essential. EQMOD has a feature that allows control of a “flip” in a non-standard way.
When would non-standard flip be appropriate.
Here are a couple of examples:
In general, this flipped movement is really only to be attempted as a last resort. It is much better, if you can, to track through the meridian rather than used “Forced Flip GoTo's”. In addition, flipped gotos may not be as accurate as normal goto as the alignment model was not designed with them in mind. Fir this reason, the user must not create a model that includes a mixture of points added from normal and flipped positions.
It is important that anyone considering flipped gotos also reviews the meridian limit functionality and the associated movement strategies that EQASCOM applies. See the youtube presentations at
How to use non-standard flip feature.
When the mount moves it will follow the strategy outlined in the Mount Movement Strategies topic.