Average elevation 
  Track 1 = 72
  Track 2 = 61

##</code><code>##

use Geo::Gpx;
open $fh, "W20120129101405.gpx" ; 
my $gpx = Geo::Gpx->new( input => $fh );
my $tracks = $gpx->tracks();
print  Dumper ($tracks);

##</code><code>##

$VAR1 =  = [
        {
            'name' => 'Track 1',
            'segments' => [
                {
                    'points' => [
                        {
                            'lat' => '54.5182217145253',
                            'ele' => '73.0',
                            'lon' => '-2.62191579018834'
                        },
                        {
                            'lat' => '54.1507759448355',
                            'lon' => '-3.05774931478646'
                            'ele' => '71.0',
                        },
                        {
                            'lat' => '54.6016296784874',
                            'lon' => '-3.40418920968631'
                            'ele' => '72.0',
                        }
                    ]
                },
                {
                    'points' => [
                        {
                            'lat' => '54.6862790450185',
                            'lon' => '-3.68760108982739'
                            'ele' => '63.0',
                       }
                    ]
                }
            ]
        },
        {
            'name' => 'Track 2',
            'segments' => [
                {
                    'points' => [
                        {
                            'lat' => '54.9927807628549',
                            'lon' => '-4.04712811256436'
                            'ele' => '60.0',
                        },
                        {
                            'lat' => '55.1148395198045',
                            'lon' => '-4.33623533555793'
                            'ele' => '61.0',
                        },
                        {
                            'lat' => '54.6214174046189',
                            'lon' => '-4.26293674042878'
                            'ele' => '62.0',
                        },
                        {
                            'lat' => '55.0540816059084',
                            'lon' => '-4.42261020671926'
                            'ele' => '59.0',
                        },
                        {
                            'lat' => '55.4451622411372',
                            'lon' => '-4.32873765338'
                            'ele' => '63.0',
                        }
                    ]
                }
            ]
        }
    ];