outdoor-tools

MeshCore firmware fork for outdoor use — GPS tracking, Off-Grid mode with Client Repeat, SOS alerts and Standalone Capabilities

What constellations are visible tonight: prominent constellations by month and hemisphere, best viewing hours and meteor showers. Free tool.

The right tent size for your people, gear and trip type — with real floor-area math.

Backpack torso size guide: measure your torso, get your pack size (XS–XL), hip-belt fit check, and load-range advice. Free tool.

Hiking difficulty calculator: rate any trail from distance and elevation gain, with Naismith time estimates. Free outdoor tool.

Tide height calculator: enter hours since high tide to get current tide state, next high/low times, a 24h curve, and fishing windows. Free tool.

Free knot tying guide: learn 6 essential knots step by step — bowline, clove hitch, figure-8, sheet bend, taut-line hitch and reef — with clear diagrams.

Today's best fishing windows from solunar theory — majors, minors and moon phase.

Realistic hiking time from distance, elevation, fitness and breaks — plan your turnaround.

Estimate how much water to carry on a hike based on distance, pace, elevation, weather, UV exposure, and personal hydration factors