Get Navigation TermStored and Navigation TermStoreId for a Web Using PowerShell

I was working with managed navigation for a web site. I needed to get the navigation termstore and navigation termset ids for the web site. We had a choice to hard-code these parameters or to get it as a user input. But we can easily get these values from the SPWeb object properties. Following PowerShell function would return a custom PowerShell object with these properties. 

function GetNavigationInfo
{
    param(
        [Parameter(Mandatory=$true, Position=0, ParameterSetName="web",
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true,
                   HelpMessage="The SPWeb object to get navigation information for")]
                   [Microsoft.SharePoint.SPWeb]$web
        )
        $NavXML = $web.Properties["_webnavigationsettings"];
        #write-host $NavXML -foreground yellow
        [xml]$file =[xml]$NavXML
        $xmlProperties = $file.WebNavigationSettings.SiteMapProviderSettings.TaxonomySiteMapProviderSettings|where {$_.name -eq "CurrentNavigationTaxonomyProvider"}
        $NavInfo = @{
            TermStoreId = $xmlProperties.TermStoreId
            TermSetId = $xmlProperties.TermSetId
        }
    return $NavInfo
}

Usage 

$web = Get-SPWeb <weburl here>
$NavInfo = GetNavigationInfo($web);
$TaxSession = Get-SPTaxonomySession -Site $web.Site
$TermStore = $TaxSession.TermStores[$NavInfo.TermStoreId]
$TermSet = $TermStore.GetTermSet($NavInfo.TermSetId)