SharePoint 2013
In a subsite I'm developing that uses the Oslo masterpage, it seems that the structrual navigation (side navigation) is used on top while the global navigation (Seattle's top bar) is missing. Rather than finding a way to display the global navigation (and change the whole site collection), I want to use a custom webpart that displays a list of links that can take the place of the side navigation menu.
The question is that how can I put such a webpart in the masterpage so that it displays itself throughout the subsite and only that particular subsite?