In 1807, the New York city council appointed a team of commissioners to survey the island of Manhattan and lay out a plan for future growth. When they unveiled their plan in 1811, the entire island north of the established city had been carved into a tremendous grid. The regularity of the plan yields an additional benefit, which X-Man harnesses. The building numbers along the avenues and streets progress at a mostly constant rate, allowing the design of an algorithm for predicting a cross street near to a given street address. X-Man knows about both Manhattan's avenues and streets.
Avenues run north and south and, with a few exceptions, are named.
Streets are numbered and run east to west. When you start X-Man, you see the address entry screen, which includes a list of roads. You can switch between the two by using the double-headed arrow buttons in the upper right. With the correct list showing, you enter the address in which you are interested in the two blanks at the top of the field. The first field is for the building number, and the second is for the name of the road.