Chirps & NFC
A chirp is a wireless beacon designed specifically for the outdoor adventures of geocaching. Chirp can communicate with, and be programmed by, any compatible wireless-enabled Garmin handheld. You can also use an iPhone with the geobeacon app along with a Wahoo Fitness ANT+ dongle key & apparently some Android phones now.
NFC (near field communications) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other
NFC (near field communications) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other