User`s guide

Chapter 5 - I/O Commands
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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y.y = HDOP
a.a, z = antenna height
a.a = height
z = units M = meters
g.g, z geoidal separation
g.g height
z units M = meters
t.t age of differential data
iiii differential reference station ID 0000..1023
CC = checksum