Unlike larger institutions, at Gettysburg, there's no need to deal with the confusion of bus lines and schedules. Firstly, there just aren't any and, secondly, because there is simply no reason why you would need to go anywhere that far. The entire campus can be traversed in about 20 minutes by foot, and just about every academic building can be reached from any dorm building within 15 minutes-and usually much quicker.
The school does offer transportation off campus, including shuttles to the three nearby major airports and all other public transportation hubs. Though the price is a little high, and it requires reservations, it is a convenient and generally reliable way to get to and from the airports and stations. Around academic breaks, transportation services opens up its schedule, offering frequent shuttles to local airports.