Hi both, thanks for the replies. Unfortunately keeping times the same across the devices is not possible as they operate in different countries and are serviced and accessed by individuals who will expect the time to reflect their location. I guess I could do that, but I would then need to know what the timezone is so that I can adjust the time accordingly for the users.
I am now using CCED and Geolocation to track my modems (roughly). Although I think I will also implement NITZ as a comparison and alternative as I guess Geolocation will not always work / we accurate enough etc.
Thanks,
Karl