Trail Navigation Calculator

Hiking time (Naismith's Rule) and lightning safety distance.

Distance (miles)

Elevation gain (ft)

Elevation loss (ft)

Fitness Level

Flash-to-thunder (sec)

Tab to move between fields

Total hiking time (hrs)

5.5

Naismith time (hrs)4.2

Fitness-adjusted (hrs)5.2

Effective pace (mph)1.44

Lightning distance (mi)0

Lightning distance (km)0

Lightning safe?1

Hours needed5.5

How to Use This Calculator

Enter starting coordinates (or trailhead GPS location) and destination coordinates.
Enter bearing (degrees), trail distance (miles or km), and elevation profile.
Read estimated hiking time using Naismith's Rule (1 hour per 3 miles + 1 hour per 2,000 ft gain).
Review azimuth and back-bearing for land navigation with a compass.
Add a safety buffer of 20-30% to time estimates for terrain, weather, and group pace variation.

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