I have the same thing - a slight downhill the entire way into work, and 9 times out of 10 a stiff tailwind. It's why my speed is 20 mph or so on the way in, but I'm lucky to break double digits on the way home. (Though since I started working nights it's been better, as the wind is usually quieter in the morning.)

No maps though - the GPS on my phone isn't accurate at all out here.