Nav & the wheel
Like the wheel Navigation dosn't require re-inventing!
Nav didn't start 90 years ago but many thousands of years before.
The Ancient Babylonians (the Marsh people of Iraq) first devised the 1:60 rule, the Radian. Polynesian sailers have used the principle of maintaining a track right angles to the rings eminating from a central point (i.e. land mass) for thousands of years and then homed using the same.
In teaching the 'whizz wheel' an oportunity also arises to teach; an understanding of the relationship of distance (angular change) and time (motion). i.e. why it is that you can divide and multiply together what would otherwise appear to be different things.