save current map view or list of places as "set" to use offline 

it will be nice to have the possibility to see formerly stored wheelmpa informations without have a data connection.
so you can use wlan at home or work to find places and then save this set of informations for later offline use.

Each set shoud have a user given name like "ausflug berlin" and a timestamp.
Each set must be deletable for the user.
