MarMax,
To set a radar up for finding the birds you will want to have everything out of Auto and in manual mode. Turn your Rain and Sea all the way to 0 . Then take your Gain and turn it up until it washes out the screen with returns. Then start backing the Gain down until the screen starts to clean up a bit. while looking for birds you want the radar to be as sensitive as possible and you may see some returns that are wave tops or other objects than birds. The best way to know what birds look like to find some birds and then slowly drive away from then and try tracking them on the radar.