Play around with it for a while and you'll actually end up finding something interesting. Also, you can copy the link for it and share it with anyone you like. You can actually embed the snap anywhere else if you like. Just click on the search bar on the top left hand corner and do a search of a city or a place. You even have the option to search for anything on the Snap Map too. Just click the blue (till red/black) areas and a snap will load up in a few seconds - blue represents very low activity whereas black represents high. If more than 8 hours has passed and a Snapchatter has not opened the app, their location will disappear from the Map entirely.Once here, you'll see everything that is being posted around you publicly shown as a heat map.

A friend’s location will remain on the Map for up to 8 hours if they do not open the app again, causing their location to update.

Their location reflects where they last opened Snapchat. If you tap on your friend, you will see when their location was updated (i.e., 1 hour ago, 2 hours ago).(This period of time was not specified.) Some more general location data may be retained a little longer (this time was also not specified), but the company says that is also subject to regular deletion.

Snapchat will delete precise location data after a short period of time.

Only mutual friends can see each other on the Map.

If a Snapchatter chooses to share their location with all of their friends on Snapchat, the app will remind them of that choice periodically to make sure they are still comfortable with this.

If you are choosing to share your location on the Map, your location is updated every time the Snapchat app is opened.

Large snap map