What do I need for a simple set up of a Nasa AIS radar?

[ianwoods]

Guidance needed please.
I am to buy a NASA AIS Radar to use as a stand alone. I will use a VHF aerial on the pushpit. What can I buy to give it a GPS position? eg a cheap gps aerial?
I have a small Lowrance hand held but would prefer the Nasa to be totally stand alone.

[Sy-Revolution]

One of these is a good enough option.

http://www.yachtbits.com/evermore_gp...s_antennas.php

I have one connected to the DSC and Navtex receiver with no problems. Fair bit cheaper than the Raymarine equivalent.