A podguide is an enhanced audio tour podcast

Podcast

A podcast is a series of digital media files that are released episodically and often downloaded through web syndication...

. It is a single audio file where each chapter displays a picture and a number of what to look at a certain stopover. The numbers correspond to the numbers on a map that can be downloaded via the link incorporated into the artwork of the chapters in the podguide. Podguides are in the m4a format and can only be listened to through iTunes

ITunes

iTunes is a media player computer program, used for playing, downloading, and organizing digital music and video files on desktop computers. It can also manage contents on iPod, iPhone, iPod Touch and iPad....

 or an iPod

IPod

iPod is a line of portable media players created and marketed by Apple Inc. The product line-up currently consists of the hard drive-based iPod Classic, the touchscreen iPod Touch, the compact iPod Nano, and the ultra-compact iPod Shuffle...

. It is like a soundseeing tour but with pictures and a map, so users can take the tour themselves.