Converted from a novatel BESTPOS message.
http://docs.ros.org/api/novatel_msgs/html/msg/BESTPOS.html
More information on page 123 of SPAN® on OEM6® Firmware Reference Manual
https://www.novatel.com/assets/Documents/Manuals/OM-20000144UM.pdf

latitude (degrees)
longitude (degrees)
altitude (m)
undulation (m)
latitude_std (m)
longitude_std (m)
altitude_std (m)
solution_status
position_type
datum_id
stn_id
diff_age
sol_age
svs
sol_svs
l1_svs
mult_svs
reserved
extsolstat
gal_sig_mask
sig_mask
