// Creating closures to preserve values within the loop
function slocumCallback(i, data) {
    return function(telemetry) {
        gliderTrack = [];
        for(var x=0; x<telemetry.length; x++) {
            gliderTrack.push(new L.latLng(telemetry[x]['lat'], telemetry[x]['lon']));
        }
        window['m'+data[i]['id']] = [];
        window['m'+data[i]['id']]['line'] = L.polyline(gliderTrack, {color: 'red'});
        window['m'+data[i]['id']]['currentTrackRemovable'] = true;
        window['m'+data[i]['id']]['data'] = data[i];
        generateHTML(i, data);
    };
}