FYI:

I've been planting with an Integra and GPS1600, for the last 3 days and the "GPS corner icon" always turned green and it has worked fine and my row clutches are working fine.

(Got done planting last night) I see 10-12 satellites. 

I haven't had to adjust or "set" anything; with the Integra and 1600 unit, and it has been working.