Modifications

var x = xPos * size;

var y = yPos * size;

context.beginPath();

context.moveTo(x, y);

$(".smwtable tr:not(:has(td.Localisation)):has(td.Position)").each(function()

{

var pos = $("td.Position", this).text();

var xPos = (pos.substr(0, pos.indexOf(':')) - mapData[0]);