NavSatStatus
This is a ROS message definition.
Source
# Navigation Satellite fix status for any Global Navigation Satellite System.
#
# Whether to output an augmented fix is determined by both the fix
# type and the last time differential corrections were received.  A
# fix is valid when status >= STATUS_FIX.
int8 STATUS_UNKNOWN = -2        # status is not yet set
int8 STATUS_NO_FIX =  -1        # unable to fix position
int8 STATUS_FIX =      0        # unaugmented fix
int8 STATUS_SBAS_FIX = 1        # with satellite-based augmentation
int8 STATUS_GBAS_FIX = 2        # with ground-based augmentation
int8 status -2 # STATUS_UNKNOWN
# Bits defining which Global Navigation Satellite System signals were
# used by the receiver.
uint16 SERVICE_UNKNOWN = 0  # Remember service is a bitfield, so checking (service & SERVICE_UNKNOWN) will not work. Use == instead.
uint16 SERVICE_GPS =     1
uint16 SERVICE_GLONASS = 2
uint16 SERVICE_COMPASS = 4      # includes BeiDou.
uint16 SERVICE_GALILEO = 8
uint16 service