I took along my car sat-nav today on a two hour flight around Kent and East Sussex just for fun. To my surprise I found it quite useful to confirm position on occasion. Mostly I was navigating using Memory Map blown up charts. So no purple line to follow and cost me not a penny in extra kit.
Looking outside the window? Absolutely - else what was the point of the flight?
Having said all that though - when I got home and downloaded the track from the basic walker type Garmin I keep in my flight bag behind the seat - I found I had been just a hair's breadth from the edge of Rochester's ATZ!
Incidentally, a lovely day for flying despite the pessimistic forecast.