I believe raven can pretty much run any reciever on their system. I personally seen JD recievers and trimble being used. I dont believe they were much better than ravens own though. The next couple of years could be quite exciting in the GPS world with a lot of companys trying to take that next big step forward. Costs look like the are going to drop significantly as well. Its starting to be a really competitive market out there which can only be a good thing