SnoWhere uses Bluetooth to detect your friends (and to allow your friends to detect you). Unfortunately WiFi interferes with Bluetooth.

If you’re trying SnoWhere with your iPhone’s WiFi turned on (or are within range of a WiFi hotspot) then SnoWhere’s ability to detect your friends is reduced. Fortunately, out in the mountains where you need SnoWhere the most, there are few WiFi hotspots.

For best performance, please turn off WiFi on your iPhone® when you go out into the mountains.

Encourage your friends to do the same: having to turn your iPhone’s WiFi on when you stop for lunch or get back at the end of the day is a small price to pay for improved SnoWhere performance.