McMurdo's numbers on accuracy are bogus. All GPS PLBs have the same accuracy as it is not dependent upon the GPS, but rather on the limitations of the digital coding.
The difference for the quoted accuracy figures may be down to whether whether a 2D Circular Error Probability CEP or 3D Spherical Error Probability SEP is being quoted by the 2 different manufacturers. SEP is always worse than CEP by about 1.4 times which would account for the difference so it could well be that the accuracy figure of 60 metres quoted by McMurdo is not bogus at all.
BTW not all GPS receivers are the same, some have better accuracy due to better design in clock stability, antenna design and sensitivity and firmware differences.
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