This project is supposed to synchronise with the Internet via a PC to
> ensure "accurate timekeeping"
>
> How accurate can it be, when any time signal derived via the internet
> will be delayed by the unpredictable latency of the network ?
>
> The claimed accuracy in stand alone mode, running off a watch crystal
> is 2 seconds a day. Are you really going to improve it by a daily
> sync with the net ? I would have thought that all you will achive will
> be to keep the clock in step with your PC and the net service from
> which the PC's time is derived +/- the latency error.
>
> Any ideas ?
As others have pointed point, latency isn't really a problem.
From a practical point of view though it's a fairly useless project. For starters it's got no seconds display, USB sync is such a pain that no one will bother (unless you sit on your desk next to the computer), and who is going to want a hand held project box like that as a feature clock anyway? It's really just a demonstration project rather than being of any practical worth. Nothing wrong with that though I suppose.
Dave.