#if defined (DOC)
C     COMDECK NAMGPSGB
#endif
      NAMELIST /NAMGPSGB/ DZMIN, DZMAX, YZTDERR, NJLEVP,
     +   LASSMET, YSFERRWGT, L1GPSOBS, CGPSSTN, YZDERRWGT,
     +   RCK1, RCK2, RCK3