GPS to arduino and arduino to ethduino

Hello guys!

Toghether with a frien we have an task to do. We must connect an GPS module to an microcontroller and thsi microcontroller have to send data ( coordinates ) over ethernet to an wireless router who is on a boat.
I love arduino and I will like to do it with Arduino , Ethduino for ethernet layer and an GPS module SiRFstarIII-FASTRAX.

Can anybody help us to make some connections or to help us with an easy to connect gps module ? We like to use SiRFstarIII-FASTRAX because is easy to find in my country.

Thanks in advance.