var airfields = L.layerGroup();
var airfields_active = L.layerGroup();
var task_lines = L.layerGroup();

var map = L.map('map', {
  center: [51.7119539, -2.1352713],
  zoom: 7,
  minZoom: 6,
  maxZoom: 9
});

L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

/*L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', {
  maxZoom: 18
}).addTo(map);

L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_only_labels/{z}/{x}/{y}.png', {
  maxZoom: 18,
  zIndex: 10
}).addTo(map);*/

var bounds = L.latLngBounds();
airfield = L.circle([57.07568000, -2.84504000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.deesideglidingclub.co.uk" target="_blank">Aboyne</a><br/>');
airfield.id = 1;
airfields.addLayer(airfield);
airfield = L.circle([54.37316000, -4.42918000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.manxgliding.org" target="_blank">Andreas</a><br/>');
airfield.id = 2;
airfields.addLayer(airfield);
airfield = L.circle([51.71218000, -2.12612000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.cotswoldgliding.co.uk" target="_blank">Aston Down</a><br/>118.665');
airfield.id = 3;
airfields.addLayer(airfield);
airfield = L.circle([51.91297000, -1.14034000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('Bicester<br/>');
airfield.id = 5;
airfields.addLayer(airfield);
airfield = L.circle([52.14113000, -1.84533000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bidfordglidingandflyingclub.co.uk" target="_blank">Bidford</a><br/>');
airfield.id = 6;
airfields.addLayer(airfield);
airfield = L.circle([50.80256000, -0.66471000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.brgc.co.uk" target="_blank">Bognor Regis</a><br/>');
airfield.id = 7;
airfields.addLayer(airfield);
airfield = L.circle([53.88616000, -2.61998000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bfgc.co.uk" target="_blank">Bowland Forest</a><br/>');
airfield.id = 8;
airfields.addLayer(airfield);
airfield = L.circle([53.74956000, -1.09707000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.burnglidingclub.co.uk" target="_blank">Burn</a><br/>');
airfield.id = 9;
airfields.addLayer(airfield);
airfield = L.circle([53.30354000, -1.72804000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.glidingclub.org.uk" target="_blank">Camphill</a><br/>');
airfield.id = 10;
airfields.addLayer(airfield);
airfield = L.circle([51.17927000, 1.28005000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.channelglidingclub.com" target="_blank">Channel Gliding Club</a><br/>');
airfield.id = 11;
airfields.addLayer(airfield);
airfield = L.circle([52.71151000, -0.13386000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.psgc.co.uk" target="_blank">Crowland</a><br/>');
airfield.id = 12;
airfields.addLayer(airfield);
airfield = L.circle([53.24776000, -0.85156000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.darltonglidingclub.co.uk" target="_blank">Darlton</a><br/>');
airfield.id = 13;
airfields.addLayer(airfield);
airfield = L.circle([50.59155000, -4.15237000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.dartmoorgliding.co.uk" target="_blank">Dartmoor Gliding Society</a><br/>');
airfield.id = 14;
airfields.addLayer(airfield);
airfield = L.circle([50.71240000, -2.21756000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.dorsetglidingclub.co.uk" target="_blank">Dorset Gliding Club</a><br/>');
airfield.id = 15;
airfields.addLayer(airfield);
airfield = L.circle([54.94311000, -3.74090000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.dumfriesanddistrictglidingclub.co.uk/" target="_blank">Dumfries & District Gliding Club</a><br/>');
airfield.id = 16;
airfields.addLayer(airfield);
airfield = L.circle([51.87309000, -0.54952000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.londonglidingclub.com" target="_blank">Dunstable</a><br/>');
airfield.id = 17;
airfields.addLayer(airfield);
airfield = L.circle([50.92788000, -3.98482000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.eaglescott-airfield.com" target="_blank">Eaglescott</a><br/>');
airfield.id = 18;
airfields.addLayer(airfield);
airfield = L.circle([57.58701900, -3.30376900], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.highglide.co.uk" target="_blank">Easterton</a><br/>');
airfield.id = 19;
airfields.addLayer(airfield);
airfield = L.circle([51.93161000, -1.44181000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.enstoneaerodrome.co.uk" target="_blank">Enstone</a><br/>');
airfield.id = 20;
airfields.addLayer(airfield);
airfield = L.circle([57.10602000, -3.88713000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.gliding.org" target="_blank">Feshiebridge</a><br/>');
airfield.id = 21;
airfields.addLayer(airfield);
airfield = L.circle([52.16606000, -0.11736000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.camgliding.uk" target="_blank">Gransden Lodge</a><br/>');
airfield.id = 22;
airfields.addLayer(airfield);
airfield = L.circle([51.25990000, -2.72914000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.mendipgliding.co.uk" target="_blank">Halesland</a><br/>');
airfield.id = 23;
airfields.addLayer(airfield);
airfield = L.circle([52.03207000, -1.21141000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.banburygliding.co.uk" target="_blank">Hinton in the Hedges</a><br/>');
airfield.id = 24;
airfields.addLayer(airfield);
airfield = L.circle([52.43718000, -1.05176000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.theglidingcentre.co.uk" target="_blank">Husbands Bosworth</a><br/>127.580');
airfield.id = 25;
airfields.addLayer(airfield);
airfield = L.circle([51.30124000, -0.09377000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.surreyhillsgliding.co.uk" target="_blank">Kenley</a><br/>');
airfield.id = 26;
airfields.addLayer(airfield);
airfield = L.circle([51.20946000, 0.83103000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.kent-gliding-club.co.uk" target="_blank">Kent Gliding Club</a><br/>');
airfield.id = 27;
airfields.addLayer(airfield);
airfield = L.circle([53.45953000, -0.58266000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.tvgc.org.uk" target="_blank">Kirton in Lindsey</a><br/>');
airfield.id = 28;
airfields.addLayer(airfield);
airfield = L.circle([51.19024000, -1.03260000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.lasham.org.uk" target="_blank">Lasham</a><br/>131.030');
airfield.id = 29;
airfields.addLayer(airfield);
airfield = L.circle([50.82069000, -1.20324000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.pngc.co.uk" target="_blank">Lee on Solent</a><br/>');
airfield.id = 30;
airfields.addLayer(airfield);
airfield = L.circle([53.04657000, -3.21909000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.nwgc.org.uk" target="_blank">Llantysilio</a><br/>');
airfield.id = 31;
airfields.addLayer(airfield);
airfield = L.circle([53.20826000, -3.39429000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.denbighgliding.co.uk" target="_blank">Lleweni Parc</a><br/>');
airfield.id = 32;
airfields.addLayer(airfield);
airfield = L.circle([52.51860000, -2.88080000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.midlandgliding.club" target="_blank">Long Mynd</a><br/>');
airfield.id = 34;
airfields.addLayer(airfield);
airfield = L.circle([52.46360000, -0.58309000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.wellandgc.co.uk" target="_blank">Lyveden</a><br/>');
airfield.id = 35;
airfields.addLayer(airfield);
airfield = L.circle([55.58941000, -2.08443000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bordersgliding.co.uk" target="_blank">Milfield</a><br/>');
airfield.id = 36;
airfields.addLayer(airfield);
airfield = L.circle([52.43215000, -0.14722000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.nvgc.org.uk" target="_blank">Nene Valley Gliding Club</a><br/>');
airfield.id = 37;
airfields.addLayer(airfield);
airfield = L.circle([50.85286000, -3.26734000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.dsgc.co.uk" target="_blank">North Hill</a><br/>');
airfield.id = 38;
airfields.addLayer(airfield);
airfield = L.circle([54.93437000, -1.83919000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.northumbriagliding.co.uk" target="_blank">Northumbria Gliding Club</a><br/>');
airfield.id = 39;
airfields.addLayer(airfield);
airfield = L.circle([51.71520000, -2.28302000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bggc.co.uk" target="_blank">Nympsfield</a><br/>129.980');
airfield.id = 40;
airfields.addLayer(airfield);
airfield = L.circle([50.92187000, -0.47398000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.southdowngliding.co.uk" target="_blank">Parham</a><br/>');
airfield.id = 41;
airfields.addLayer(airfield);
airfield = L.circle([53.92176000, -0.79143000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.wolds-gliding.org" target="_blank">Pocklington</a><br/>');
airfield.id = 42;
airfields.addLayer(airfield);
airfield = L.circle([56.18904000, -3.32183000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.scottishglidingcentre.co.uk" target="_blank">Portmoak</a><br/>');
airfield.id = 43;
airfields.addLayer(airfield);
airfield = L.circle([52.64489000, -2.30922000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.wrekinglidingclub.co.uk" target="_blank">RAF Cosford</a><br/>');
airfield.id = 44;
airfields.addLayer(airfield);
airfield = L.circle([53.04079000, -0.50246000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.cranwellgc.co.uk" target="_blank">RAF Cranwell</a><br/>');
airfield.id = 45;
airfields.addLayer(airfield);
airfield = L.circle([51.78629000, -0.73624000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.raf.mod.uk/rafgliding" target="_blank">RAF Halton</a><br/>');
airfield.id = 46;
airfields.addLayer(airfield);
airfield = L.circle([51.30392330, -2.12192770], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bannerdown.co.uk" target="_blank">RAF Keevil</a><br/>');
airfield.id = 47;
airfields.addLayer(airfield);
airfield = L.circle([57.58643300, -3.32121900], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.raf.mod.uk/rafgliding/contacts/fulmar.cfm" target="_blank">RAF Kinloss</a><br/>');
airfield.id = 48;
airfields.addLayer(airfield);
airfield = L.circle([52.65241000, 0.54509000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.fenlandgc.co.uk" target="_blank">RAF Marham</a><br/>');
airfield.id = 49;
airfields.addLayer(airfield);
airfield = L.circle([51.24046000, -0.94521000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.kestrel-gliding.org.uk" target="_blank">RAF Odiham</a><br/>');
airfield.id = 50;
airfields.addLayer(airfield);
airfield = L.circle([51.88102000, -1.22785000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.oxfordgliding.com" target="_blank">RAF Weston on the Green</a><br/>');
airfield.id = 51;
airfields.addLayer(airfield);
airfield = L.circle([52.16959000, 0.87509000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.rattlesdengliding.com/" target="_blank">Rattlesden</a><br/>');
airfield.id = 52;
airfields.addLayer(airfield);
airfield = L.circle([52.04953000, 0.55768000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.essexgliding.com" target="_blank">Ridgewell</a><br/>');
airfield.id = 53;
airfields.addLayer(airfield);
airfield = L.circle([50.90914000, 0.10553000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.sussexgliding.co.uk" target="_blank">Ringmer</a><br/>');
airfield.id = 54;
airfields.addLayer(airfield);
airfield = L.circle([51.33725000, -1.54452000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.shalbournegliding.co.uk" target="_blank">Rivar Hill</a><br/>');
airfield.id = 55;
airfields.addLayer(airfield);
airfield = L.circle([50.08176000, -5.25784000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.rngsa.com/index.php/seahawk" target="_blank">RNAS Culdrose</a><br/>');
airfield.id = 56;
airfields.addLayer(airfield);
airfield = L.circle([51.01358000, -2.64780000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://heronglidingclub.moonfruit.com" target="_blank">RNAS Yeovilton</a><br/>');
airfield.id = 57;
airfields.addLayer(airfield);
airfield = L.circle([53.94222000, -1.18997000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.yorkglidingcentre.co.uk" target="_blank">Rufforth</a><br/>');
airfield.id = 58;
airfields.addLayer(airfield);
airfield = L.circle([52.26210000, -0.47764000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.sackvilleflyingclub.co.uk" target="_blank">Sackville</a><br/>');
airfield.id = 59;
airfields.addLayer(airfield);
airfield = L.circle([52.83020000, -0.70029000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.buckminstergc.co.uk" target="_blank">Saltby</a><br/>');
airfield.id = 60;
airfields.addLayer(airfield);
airfield = L.circle([51.60698000, -1.66949000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.motorglide.co.uk" target="_blank">Sandhill Farm</a><br/>129.980');
airfield.id = 61;
airfields.addLayer(airfield);
airfield = L.circle([52.82777000, -2.20900000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.staffordshiregliding.co.uk" target="_blank">Seighford</a><br/>');
airfield.id = 62;
airfields.addLayer(airfield);
airfield = L.circle([52.08017000, -1.47345000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.shenington-gliding.co.uk" target="_blank">Shenington</a><br/>');
airfield.id = 63;
airfields.addLayer(airfield);
airfield = L.circle([52.24344000, -2.88381000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.shobdongliding.co.uk" target="_blank">Shobdon</a><br/>');
airfield.id = 64;
airfields.addLayer(airfield);
airfield = L.circle([54.69345000, -2.57918000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.edensoaring.co.uk" target="_blank">Skelling Farm</a><br/>');
airfield.id = 65;
airfields.addLayer(airfield);
airfield = L.circle([52.83391000, -2.76763000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.shropshiresoaring.co.uk" target="_blank">Sleap</a><br/>');
airfield.id = 66;
airfields.addLayer(airfield);
airfield = L.circle([52.23568000, -1.71059000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.stratfordgliding.co.uk" target="_blank">Snitterfield</a><br/>');
airfield.id = 67;
airfields.addLayer(airfield);
airfield = L.circle([53.30342000, 0.16814000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.lincsgliding.org.uk" target="_blank">Strubby</a><br/>');
airfield.id = 68;
airfields.addLayer(airfield);
airfield = L.circle([54.22883000, -1.20964000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.ygc.co.uk" target="_blank">Sutton Bank</a><br/>');
airfield.id = 69;
airfields.addLayer(airfield);
airfield = L.circle([51.97914000, -3.20344000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.blackmountainsgliding.co.uk" target="_blank">Talgarth</a><br/>');
airfield.id = 70;
airfields.addLayer(airfield);
airfield = L.circle([51.13063900, -2.22628200], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bwnd.co.uk" target="_blank">The Park</a><br/>');
airfield.id = 71;
airfields.addLayer(airfield);
airfield = L.circle([52.45721000, 1.16124000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.norfolkglidingclub.com" target="_blank">Tibenham</a><br/>');
airfield.id = 72;
airfields.addLayer(airfield);
airfield = L.circle([55.13789000, -6.96489000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.ulsterglidingclub.org" target="_blank">Ulster Gliding Club</a><br/>');
airfield.id = 73;
airfields.addLayer(airfield);
airfield = L.circle([51.29101000, -1.77913000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.wyvernglidingclub.co.uk" target="_blank">Upavon</a><br/>');
airfield.id = 74;
airfields.addLayer(airfield);
airfield = L.circle([51.71792000, -2.84326000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.uskgc.co.uk" target="_blank">Usk</a><br/>');
airfield.id = 75;
airfields.addLayer(airfield);
airfield = L.circle([54.12518000, -3.26031000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://WWW.LAKESGC.CO.UK" target="_blank">Walney</a><br/>');
airfield.id = 76;
airfields.addLayer(airfield);
airfield = L.circle([52.12280000, 0.96776000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.angliaglidingclub.org.uk" target="_blank">Wattisham</a><br/>');
airfield.id = 77;
airfields.addLayer(airfield);
airfield = L.circle([51.94407000, 0.80292000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://esgc.co.uk" target="_blank">Wormingford</a><br/>');
airfield.id = 78;
airfields.addLayer(airfield);
airfield = L.circle([51.61017000, -0.80107000], 2000, {color: '#fa0', fillColor: '#fa0', fillOpacity: 0.5}).addTo(map).bindPopup('<a href="http://www.bookergliding.co.uk" target="_blank">Wycombe Air Park</a><br/>');
airfield.id = 79;
airfields.addLayer(airfield);

//var openaip_cached_basemap = new L.TileLayer("http://{s}.tile.maps.openaip.net/geowebcache/service/tms/1.0.0/openaip_basemap@EPSG%3A900913@png/{z}/{x}/{y}.png", {
var openaip_cached_basemap = new L.TileLayer("https://skylines.aero/mapproxy/tiles/1.0.0/airspace+airports/EPSG3857/{z}/{x}/{y}.png", {
//  tms: true,
//  detectRetina: true,
//  subdomains: '12',
//  format: 'image/png',
//  transparent: true,
  opacity: 0.8,
  attribution: 'Airspace from <a href="https://www.openaip.net" target="_blank">openAIP</a>'
});

var flying = false;
var pending_event = null;

$.each(airfields.getLayers(),function(index, el){
  el.bringToFront();
});

$.each(airfields_active.getLayers(),function(index, el){
  el.bringToFront();
});

if (bounds.isValid()) {
  map.fitBounds(bounds, {maxZoom: 8});
}

$('.airfield-pan').click(function($e){
  $e.preventDefault();
  
  id = $(this).data('id');
  
  airfields_active.eachLayer(function(layer){
    if (layer.id == id) {
      pending_event = layer;
    }
  });
  
  airfields.eachLayer(function(layer){
    if (layer.id == id) {
      pending_event = layer;
    }
  });
  
  map.flyTo($(this).data('coord'), 9);
  flying = true;
});

map.on('moveend', function(e){
  if (flying) {
    if (pending_event != null) {
      pending_event.openPopup();
      pending_event = null;
    }
    flying = false;
  }
});

$('.task-pan').click(function($e){
  $e.preventDefault();
  map.flyTo($(this).data('coord'), 9);
});

L.easyButton({
  states: [{
    stateName: 'show-airspace',
    icon: 'glyphicon-screenshot',
    title: 'Show airspace',
    onClick: function(btn, map) {
      map.addLayer(openaip_cached_basemap);
      btn.state('hide-airspace');
    }
  }, {
    stateName: 'hide-airspace',
    icon: 'glyphicon-ban-circle',
    title: 'Hide airspace',
    onClick: function(btn, map) {
      map.removeLayer(openaip_cached_basemap);
      btn.state('show-airspace');
    }
  }]
}).addTo(map);