In the previous post I assumed he just needed to track his aircraft, he is also ground based, at the flying club.
With a complete PAW installation in each aircraft, he has the advantage of offering collision avoidance to his members as well as being able to track them via FR24, or in the air via ADSB, assuming his fleet are equipped with Mode S. A cheap tablet with XC Soar (see other thread), could provide the display.