What You Need
1. Two NICs on your Navigator computer, one that can see the internet and one that is in the WNIP subnet.
2. The Meinberg NTP daemon, available
here.

You could install this on another machine that isn't running Navigator but is connected to both networks, Navigator isn't necessarily required to be running on this machine. The key is that it's a PC that's always on and can see both networks.
How To Set Up The NTP Server
1. Install the Meinberg application. When prompted, select the NTP pool for your country. Set it to run as a service at startup.
2. Let the daemon start.
3. Go to the Start menu and right click Edit NTP Configuration
Select Run As Administrator.
4. Notepad will open with the config file. Look for this text:
Below that you will see
# server 127.127.1.0
Edit that line to remove the # and change the IP to your WNIP network card on the machine. For example, on our test system, the PC is 192.168.87.100. So our net.conf file says:
This will serve NTP to the WNIP network.
5. Either reboot the PC or open services.msc and restart the Network Time Protocol Daemon
How To Tell The Blades To Follow NTP
1. Open Navigator
2. Go to the Info tab.
3. Find Set Date and Time
Change it to NTP and enter the IP address that you just configured. Click Apply.