The breadcrumb trail is a navigation aid that allows you to find your way around and easily navigate the site. So you can see where you are and can go back at any time. It's located under the main menu, at the top of the page on the left and looks like this :
Home> Section> Sub-section> Current page 

Site map

The site map is accessible from all pages of the site, it is located at the bottom of each page.

Reading comfort

A default size is defined for each textual element on the site. You have the possibility to adjust it either from the site toolbar A+ (Agrandir la police) et A- (Diminuer la police),  or from the dedicated browser function.