I'm going to fade the line movement. The marketplace is overthinking this matchup by their heavy play on Navy. 
Notre Dame has won 16 in a row at home. The Irish have played a tougher schedule than Navy and beat them, 44-22, last season as 21 1/2-point favorites at a neutral site.
This is the last ranked regular season opponent Notre Dame faces. So the Irish won't lack motivation. 
Navy actually has a bigger game on deck with a first-place showdown in the American Athletic Conference West Division playing at home against SMU.