NTP

[geoffrey mendelson]

> Unless you already have an old smartphone that you want to keep for 
> this use, look for a simple USB GPS receiver - between $20-$40 (I can 
> see it now for $35 in Amazon 
> <http://www.amazon.com/GlobalSat-BU-353-S4-USB-Receiver-Black/dp/B008200LHW/ref=sr_1_1> 
> ). Supported natively by ntpd 
> <http://doc.ntp.org/4.2.4/drivers/driver20.html>, uses less power, 
> does not cook your brain, and slightly less useful for the NSA to spy 
> on you with :)
>
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They only ship to the  US.

Since the software we found runs on Android 2.1 up, it should be pretty 
easy to find a used phone for less than that or free.

Geoff.

-- 
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.