Deviates from RTCA DO-283A Appendix C section C.2.2 by using a different algorithm to determine position from multiple (more than two) DME, and secured with reasonableness checks.
Deviate from RTCA DO-283A Appendix C section C.2.1 by using a different weighting-algorithm to select or exclude VOR stations, and secured with reasonableness checks.
Deviates from RTCA DO-283A section 2.2.4.1.2 by scaling the approach deviation against RNP value (full scale deviation – 2 dots) instead of the discrete scale value defined in table 2-2.