Which Way Did He Go ?

GPS - Global Positioning System

• A constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails)

• 1-2 ton solar-powered satellites circle the globe at about 12,000 miles (19,300 km)

• There are at least four satellites "visible" in the sky at any time

• Works by calculating the intersection of a number of spheres.

• Galileo (Europe's version)

Why ?

• Find your location anywhere on the world...

Why ?

• Find your location anywhere on the world...

• within 150 feet

Accuracy

• Selective Availabilty

Accuracy

• Selective Availabilty

  • +- 45 meters

Accuracy

• Selective Availabilty

  • +- 45 meters

• Selective Availabilty was turned off May 1, 2000 (by President Clinton)

Accuracy

• Selective Availabilty

  • +- 45 meters

• Selective Availabilty was turned off May 1, 2000 (by President Clinton)

  • +- 6.3 meters (without SA)

Accuracy

• Selective Availabilty

  • +- 45 meters

• Selective Availabilty was turned off May 1, 2000 (by President Clinton)

  • +- 6.3 meters (without SA)

• WAAS - Wide Area Augmentation System

Accuracy

• Selective Availabilty

  • +- 45 meters

• Selective Availabilty was turned off May 1, 2000 (by President Clinton)

  • +- 6.3 meters (without SA)

• WAAS - Wide Area Augmentation System

  • +- 2 meters

Thus begat GeoCaching!

Thus begat GeoCaching!

• www.geocaching.com

Seen on a Tee Shirt:

Perl Modules

• GPS::Garmin

Sample Code

use GPS::Garmin;
$gps = new GPS::Garmin( 'Port' => '/dev/ttyUSB0' );

continued...

Sample Code

use GPS::Garmin;
$gps = new GPS::Garmin( 'Port' => '/dev/ttyUSB0' );

print "Protocol: ",            $gps->protocol,            "\n";
print "Product ID: ",          $gps->product_id,          "\n";
print "Software Version: ",    $gps->software_version,    "\n";
print "Product Description: ", $gps->product_description, "\n";

continued...

Sample Code

use GPS::Garmin;
$gps = new GPS::Garmin( 'Port' => '/dev/ttyUSB0' );

print "Protocol: ",            $gps->protocol,            "\n";
print "Product ID: ",          $gps->product_id,          "\n";
print "Software Version: ",    $gps->software_version,    "\n";
print "Product Description: ", $gps->product_description, "\n";

($sec,$min,$hour,$mday,$mon,$year) = $gps->get_time;
print "$year-$mon-$mday $hour:$min:$sec\n";

More Code

($latsign,$lat,$lnsign,$lon) = $gps->get_position;
print "$latsign $lat\n$lnsign $lon\n";

continued...

More Code

($latsign,$lat,$lnsign,$lon) = $gps->get_position;
print "$latsign $lat\n$lnsign $lon\n";

$gps->prepare_transfer("trk");
while($gps->records) {
	($lat,$lon,$time) = $gps->grab;
	print "$lat $lon, $time\n";
}

continued...

More Code

($latsign,$lat,$lnsign,$lon) = $gps->get_position;
print "$latsign $lat\n$lnsign $lon\n";

$gps->prepare_transfer("trk");
while($gps->records) {
	($lat,$lon,$time) = $gps->grab;
	print "$lat $lon, $time\n";
}

$gps->prepare_transfer("wpt");
while($gps->records) {
	($title,$lat,$lon,$desc) = $gps->grab;
	print "$title\n $lat\n $lon\n $time\n";
}

Results

[root@localhost gps]# ./t.f
Unknown product id 291, fallback to generic handler.

2005-09-29 04:01:22

Protocol: GRMN
Product ID: 291
Software Version: 360
Product Description: GPSMap60C Software Version 3.60

N 43.2591795146466
W 79.5598080590368

p
 0
 -0.0054931640625

...

 ,

GPS Device has timed out
[root@localhost gps]#                     

GPSBable

• www.gpsbabel.org

GPSBable

• www.gpsbabel.org

• To get track data:

  ./gpsbabel -t -i garmin -f /dev/ttyUSB0 -o csv -F t.f
  

GPSBable

• www.gpsbabel.org

• To get track data:

  ./gpsbabel -t -i garmin -f /dev/ttyUSB0 -o csv -F t.f
  

• Results in:

  3.36222, -79.78067,
  43.36219, -79.78084,
  43.36218, -79.78119,
  43.36247, -79.78157,
  ...
  

GPSBable

• www.gpsbabel.org

• To get track data:

  ./gpsbabel -t -i garmin -f /dev/ttyUSB0 -o csv -F t.f
  

• Results in:

  3.36222, -79.78067,
  43.36219, -79.78084,
  43.36218, -79.78119,
  43.36247, -79.78157,
  ...
  

• Note that the altitude and timestamp information is missing.

What Next ?

continued...

What Next ?

• Get GPS::Garmin to work with my GPS

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

• Archive the data (because I'm an info junky)

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

• Archive the data (because I'm an info junky)

• Plot the data

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

• Archive the data (because I'm an info junky)

• Plot the data

• Integrate with maps.google.com and satellite views ?

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

• Archive the data (because I'm an info junky)

• Plot the data

• Integrate with maps.google.com and satellite views ?

• APRS - Automatic Position Reporting System

  • http://web.usna.navy.mil/~bruninga/aprs.html

What Next ?

• Get GPS::Garmin to work with my GPS

• Get the timestamp and altitude info

• Archive the data (because I'm an info junky)

• Plot the data

• Integrate with maps.google.com and satellite views ?

• APRS - Automatic Position Reporting System

  • http://web.usna.navy.mil/~bruninga/aprs.html

• ???

Thank You