Older iPacks use a RFC-868 time server while the new iPack GPS units use SNTP time servers.
The two above time servers will work with both types of iPacks.
Hello Luke,
The time server you want to use is "wwv.nist.gov". I agree that 'wwv' is odd, but I have used it and can confirm that it works. Let me know if you run into any problems.
Pearse