Google is weird like that. I put in the address, hit search, hit directions and it takes me somewhere odd. I go to Lake Byron which is right AT the place I KNOW it should be, put in the address, hit search, and bang! And I don't know why. I'll just save those GPS coords. Thanks!
Also, make sure your GPS is in decimal mode and not minutes / seconds mode. I tried to go to the Ren Fest once and ended up in Norwood Young America by doing that.