Stations (i.e. users, computers) associate, disassociate and roam between
wireless access points (WAPs).  The relationship between stations and
WAPs is the same as between cell phones and cell towers.  For the cruznet 
system, the state changes are logged.   The locations of the WAPs are known.
The logs contain the unique 48-bit address of the station wireless
Ethernet interface and thus can identify the location of the station
within a 100 ft circle around the WAP.

The main use of this log file is to find WAPs that, for whatever
reason, are not serving users.

Stations maintain associated status with the wireless network
even when the user is not logged in.  Most computers have a
setting to completely disable wireless -- sometimes called 
airplane mode -- but it is rarely used.

Researchers who study networks are interested in user mobility
data and the cruznet logs are a rich source of this data.

We propose to publish a data set consisting of anonymized log
files along with descriptions of the locations of the WAPs.
The station addresses will be removed and replaced, one for
one, with arbitrary numbers.  Each station address will be assigned
a single tracking number, but the translation of tracking numbers
back to station addresses will not be published.