personally i use a Garmin Etrex Legend. Honestly. The way i look at it, i did all my PPL training without one, in the darwin. I had to learn to nav using a WAC, so what changes. I use it to point me in the right direction if i ever get lost. But with darwin after you learn a few tricks its easy to find your place. I will eventually upgrade to a GPSMAP 296 once I get my CPL, but for now, me Etrek is perfect