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//header-map-el  - id блока

script(src='http://api-maps.yandex.ru/2.1/?lang=ru_RU') - подключить

ymaps.ready(init);
function init () {
	var myMap = new ymaps.Map('header-map-el', {
	    center: [55.74954, 37.621587],
	    zoom: 10,
	    controls: []
	  });
}