The MAX Method
The transmission of Master Auxiliary Corrections (MAX) is based on the Master Auxiliary Concept (MAC) proposed by Leica and Geo++ in 2001 (Euler et al., 2001).
The i-MAX Method
Individualized MAX (i-MAX) was developed at the same time as MAX to support older receivers that cannot support the MAX corrections.
The Virtual Reference Station Method
Terrasat developed the Virtual Reference Station method in the late 1990s and is comparable to i-MAX.