An entity can be used with its name in a Function Expression and User Subroutines. For example, the body BD_001, which has a marker MK_001 in a model, is shown in the figure below.

Figure 8.103: Body and Marker names

The distance between the marker and the inertia reference frame of the ground can be calculated as in the following function expression.

Figure 8.104: Marker name in a Function Expression

The maker can also be defined as in the following expression in the User Subroutine.

Figure 8.105: Marker name in a User Subroutine