In Archicad terminology, a marker is a special object that has a subordinate relationship to another element, representing the element and/or saying something about it. Viewpoint markers represent viewpoints in project windows. Each viewpoint type has its own marker objects. There are default markers for each one in the Archicad library, but we (as usual) use customized stuff. Each marker
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A reference marker is a special object that can intelligently refer to viewpoints within the project or drawings placed on layouts. They also create viewpoints, which is a strange kind of double duty. Then you can also create viewpoints without markers... it's not intuitive overall. For most cases, you can think of a viewpoint as an application window. Sections, elevations,
Location: Like all markers, the location doesn't matter. Markers are selected directly in the settings dialog or info box. Detail TagOnly JM11 is just the call-out tag with no flag, direction, or area box. Use it when an area or flag marker might be confusing because of the orientation of the detail relative to the drawing you're calling it from.
Starting with AC 10, we will use 'real' section markers. When we started with AC 5.1, there were fixed section marker styles. (Like the fixed dimension ticks and arrowheads to this day.) We didn't like the available styles, so we adopted the policy of showing sections in plan with an object, independent of the SE cutting element. The independent object