Do NovAtel receivers support RTCM version 3.1

NovAtel receivers support RTCM version 3.1 packets as long as the firmware versions are 3.900 or newer for OEMV and 6.100 or newer for OEM6

The supported messages are:

v3.0 1001 L1 only GPS RTK observables
v3.0 1002 Extended L1 only GPS RTK observables
v3.0 1003 L1 and L2 GPS RTK observables
v3.0 1004 Extended L1 and L2 GPS RTK observables
v3.0 1005 Stationary RTK base station Antenna Reference Point (ARP) 
v3.0 1006 Stationary RTK base station Antenna Reference Point (ARP) with antenna height 
v3.0 1007 Extended antenna descriptor and setup information
v3.0 1008 Extended antenna reference station description and serial number
v3.0 1009 L1 only GLONASS RTK observables
v3.0 1010 Extended L1 only GLONASS RTK observables
v3.0 1011 L1 and L2 GLONASS RTK observables 
v3.0 1012 Extended L1 and L2 GLONASS RTK observables
v3.1 1014 Network Auxiliary Station Data coordinate difference between one auxiliary station and the master station 
v3.1 1015 GPS Ionospheric Correction Differences for all satellites between the master station and one auxiliary station 
v3.1 1016 GPS Geometric Correction Differences for all satellites between the master station and one auxiliary station 
v3.1 1017 GPS Combined Geometric and Ionospheric Correction Differences between the master station and one auxiliary station 
v3.0 1019 GPS ephemerides 
v3.0 1020 GLONASS ephemerides 
v3.0 1033 Receiver and antenna descriptors

The documents that describe the structure of the RTCM messaging can be acquired at: http://rtcm.org/