A support type in Lineardraft, a mid-point anchor (MPA) is a supporting mechanism, usually at the mid-point of the tension length, used to constrain the tension length and prevent along-track migration.
Lineardraft has two MPA support types. 'MPA' is for placing an MPA on a mast or drop tube, while 'MPA on Gantry' is for placing on a gantry.