Even though MEGAPOLIS has ended, you can still download the Getting Closer application into your iPhone. Open it up. If you’re standing near a MEGAPOLIS venue in Baltimore, you will hear stuff! The sounds are virtually embedded in the landscape with GPS. Getting Closer will tell you which way to go: listen carefully. You need an iPhone for this, so make friends with someone who has one, and share! Leave 1-1.5 hours to go on the field trip. You will want to bring headphones, bus fare, and your walking shoes.
Listen to them demo the app: