Summary

The directory:

/private/var/root/Library/Caches/locationd

contains:

WMM.dat
cache.plist
clients.plist
consolidated.db
ephemeris/
glgps_nvs.bin
lto2.dat
stats.plis

If we run strings on lto2.dat, the last line indicates:

BCMLTO33

which hints to a Broadcom Long Term Orbits (LTO) with Assisted-GPS (AGPS) module.

consolidated.db is an sqlite3 database keeping a record of GPS locations. It can be found at:

/private/var/root/Library/Caches/locationd

in order to extract the last known location, one can issue:

/usr/bin/sqlite3 /private/var/root/Library/Caches/locationd/consolidated.db "select latitude,longitude from CellLocation order by Timestamp desc limit 1"

We can trigger activator commands by using an application called TerminalActivator (hopefully updated soon . . .) which acts as a bridge between console commands and Activator.

gpstrigger.php

<?php
 
$pois = array(
 
  // add your own POIs to the array
  new POI(55.761895,37.628174,"notify_post 'Lock Screen'")
 
);
 
class POI
{
  var $latitude;
  var $longitude;
  var $accuracy = 10;
  var $command;
 
  function __construct() {
    $argc = func_num_args();
    $argv = func_get_args();
    if(method_exists($this,$cons='__construct'.$argc)) {
      call_user_func_array(array($this,$cons),$argv);
    }
  }
 
  function __construct4($la, $lo, $cm, $ac) {
    $this->latitude = $la;
    $this->longitude = $lo;
    $this->command = $cm;
    $this->accuracy = $ac;
  }
 
  function __construct3($la, $lo, $cm) {
    $this->latitude = $la;
    $this->longitude = $lo;
    $this->command = $cm;
  }
}
 
$db = new PDO('sqlite:/private/var/root/Library/Caches/locationd/consolidated.db');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$q = $db->prepare("SELECT Latitude,Longitude FROM CellLocation ORDER BY Timestamp DESC LIMIT 1");
$q->execute();
$row = $q->fetchObject();
 
 
foreach($pois as $poi) {
  // S = R^2 * (lo_{2}-lo_{1})(sin(la_{1}-sin(la_{2}))
  if(pow(6371*1000,2) // R_{earth} = 6371 km
    * abs($row->Longitude-$poi->longitude)
      * abs(sin($row->Latitude)-sin($poi->latitude))
        < $poi->accuracy) {
 
    system($poi->command);                                                                  
 
  }
}
 
return null;
 
?>

We can save the PHP script to /usr/local/bin and create a plist file called com.gpstrigger.plist in the directory /Library/LaunchDaemons that will run every hour and check whether our location is within the accuracy range of any POIs:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>Label</key>
        <string>com.gpstrigger</string>
        <key>ProgramArguments</key>
        <array>
            <string>/usr/bin/php</string>
            <string>/path/to/gpstrigger.php</string>
        </array>
	<key>RunAtLoad</key>
	<true/>
	<key>StartInterval</key>
	<integer>3600</integer>
</dict>
</plist>

We can program TerminalActivator to trigger any Activator action but any terminal commands are possible.