well, DeLorm and other map companies have had Serial/USB/Bluetooth GPS receivers 
available for a long time.

David Lang

probably not quite what you were thinking of, but funt

On Tue, 22 Oct 2013, Richard E. Brown wrote:

> On Oct 22, 2013, at 7:59 AM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
>
>> A way to solve this is to get hold of a USB GPS receiver and use
>> that as a time source either on the cerowrt box itself,
>
> Speaking of this, ESR made a foray into getting a company to produce such a USB GPS receiver. I never saw that it became commercially available. Have I missed it? Thanks.