I could not justify the cost of NAVI on my 2013. Nor was I pleased with the dumbed down functionality of the Honda branded GPS. The '13 CT comes with the backup camera as standard equipment (Navi or No Navi) as well as a right hand blind spot camera.
My Navi solution was simple, use my Garmin Zumo 665 that I am already using on my Honda Goldwing Touring bike.
It is a high end GPS with Lifetime Map update as part of the purchase. It also has XM Traffic and XM Weather that alerts me to road hazard on my route. It also has XM radio that I don't use in the CT as I prefer the CT XM music controls and I don't have to plug into the AUX input in the console.
Honda offers a GPS on the Honda Goldwing that most Wingers have low opinions of also, (Low functionality and High Price), sometimes I think Honda just doesn't get it...