One thing I didn't want to end up with was electronic warfare. However, I couldn't get around some bare necessities: An iPhone 4S for phone calls, pictures and videos, a battery extension for the same (mophie juice pack air), a GPS watch (Garmin Forerunner 210) to check time and coordinates of critical turning points and one charging device/backup battery for them all (SIStech PowerTank, POTA-XL-21). For light during the long twelve hours of darkness I bought a Fenix Flashlight (PD20; 180 Lumens). Ah yes, there's also a GoPro HD in my rucksack.