The GNSS device you are asking about is called a Geodetic GPS. It uses several channels and constellations (GPS and GLONASS) 

They cost upwards of 600k for a pair I think. These guys http://www.spectraprecision.com/welcome-85.kjsp?RF=PRO-EN
have a local dealer http://www.osl.co.ke/

They can advise you further.

Maybe Laban's solution is more cost effective. 


On Mon, Feb 4, 2013 at 2:02 PM, Laban Mwangi <lmwangi@gmail.com> wrote:
You can also get two independent GPS dongles and do some math to improve accuracy. Kalman filters & the normal distributions are your friends:
http://tiny/gkwjw7ck/googsear

I think the free google self driving car class had a very nice video about this. Quite intuitive once you see it.
https://www.udacity.com/file?file_key=agpzfnVkYWNpdHl1ckcLEgZDb3Vyc2UiBWNzMzczDAsSCUNvdXJzZVJldiIHZmViMjAxMgwLEgRVbml0GJbIAgwLEgxBdHRhY2hlZEZpbGUYwaAKDA


On Mon, Feb 4, 2013 at 11:28 AM, Gate Keeper <mohasq@gmail.com> wrote:
Hi,

have been looking for this device. Where can I get and for roughly how much. 


Kindly inbox.


Duncan

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--
Regards,

Mark Mwangi

markmwangi.me.ke