Ntp gps rs232 on alix+pfsense
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Hi guys , I need your help.
In the services section - > ntp I noticed that in pfsense there is the possibility to install a GPS module for the creation of a stratum 1 NTP server.
Now I pfsense 2.3 , standard version not nano , updated last night 05/04/2016 on a alix board apu1d4 .
I want to know me which GPS module take , inside the alix but also outside, in order to create the ntp server with pfsense .I saw on the net that there are some devices that act as time server function but cost much .
many thanks in advance
ps I found this receiver rs232 on ebay
http://www.ebay.it/itm/Nautica-Ricevitore-Antenna-GPS-Evermore-SA-320-seriale-RS-232-Navigazione-RS-232-/371442035464?hash=item567babab08mMHwzCBtLTU7oD-4h-XzfmA
think will be fine ?