miniGPS main goal is to perform defined actions based on your location taken from your network.
It also shows the details of the network cell, to which your phone is logged in at the moment. At the current stage, due to some problems in the Sony Ericsson firmware only the cell id is shown, but it seems to be good enough for performing some events.
You can create your own database of network cells by adding the ones you are logged to and also the ones you want to type in.
Once you have a few cells in your database you can create events on the basis of those cells:
Log in/out alarm
Log in/out switch profile
Log in/out power off
Log in/out change image
Log in/out SMS
The author suggests you can create an event to have an alarm at the moment your phone logs in (or out) a selected cell. So you will be able to sleep calmly in your train to work or school - it will wake you up precisely at your station. Since in some cities you are usually in range of a few network cells you can collect them all and put them to the groups like Home or Office and than you can create events for the whole group instead of individual cells.