Flat 2chamber Titanium Whistle. Are We There Yet? - A Compass Comparison - Hiking in Finland. Navigation?
Probably less of a concern if you only walk in the summer on well established and marked trails. Go off-trail, add some inclement weather of choice - fog, a deluge, low clouds - and throw in some challenging landscape - dense forest, wide open tundra, vast bogs - and you’ll want to carry a navigation tool of choice. And while GPS gadgetry have their place, I prefer compass and map.