The namespaces mentioned by @Steven V are automatically added to the file Views\Web.configduring the installation of the NuGet package.
<configuration>
<system.web.webPages.razor>
<pages pageBaseType="System.Web.Mvc.WebViewPage">
<namespaces>
<add namespace="MvcSiteMapProvider.Web.Html" />
<add namespace="MvcSiteMapProvider.Web.Html.Models" />
</namespaces>
</pages>
</system.web.webPages.razor>
</configuration>
Visual Studio intellisense , . @using MvcSiteMapProvider.Web.Html .