---
title: "Data Methodology | Himalayan Travel Guide"
description: "Altitudes, distances, times, prices and seasonal descriptions are planning values."
canonical: "https://www.nepaltibetbhutan.com/data-methodology"
---

Data methodology

# Data methodology: how Himalayan planning values are measured, audited, and bounded.

Altitudes, distances, times, prices and seasonal descriptions are planning values. The method and limits should be visible enough for a reader to compare options without mistaking a range for a guarantee.

**Effective** 12 August 2026 **Updated** 20 August 2026 **Format** Plain-English page

Effective date **12 August 2026**

Last updated **20 August 2026**

Privacy contact **[info@amigotrekking.com](mailto:info@amigotrekking.com)**

## 1. Elevations and Altitude Profiles

Altitude values are tied to the place or feature named—such as a settlement, sleeping point, pass, viewpoint or base camp. When a page compares routes, it distinguishes sleeping altitude from a daytime high point and uses the strongest available official source for the relevant location.

Elevation benchmarks are cross-referenced with Survey of Nepal topographical data and barometric GPS trail logs from certified expedition leaders. In alignment with Himalayan Rescue Association (HRA) guidelines, our itineraries enforce the conservative rule of limiting net sleeping elevation gain to 400–500m per day above 3,000m.

## 2. Trail Distances and Daily Walking Hours

Himalayan horizontal kilometers are notoriously deceptive: a 10 km walk with 1,000 meters of vertical ascent on rocky moraine takes far longer than 10 km on river valleys. We prioritize daily walking hours over raw distances.

Walking time is modeled on an average trekker carrying a 5–7 kg daypack, incorporating hydration breaks, acclimatization pacing, and typical high-altitude speed reduction (20–30% slower above 4,000m). Side acclimatization hikes (such as Dingboche to Nangkartshang Peak) are calculated separately.

## 3. Mountain Road Travel Times & Realities

Standard digital map estimates consistently underestimate mountain-road journeys by 50% to 100% due to single-lane switchbacks, monsoon washouts, unpaved jeep tracks, and active highway expansion (e.g., the Prithvi Highway between Mugling and Pokhara).

Our transit durations are range-based figures drawn from commercial vehicle logs, clearly distinguishing private 4WD jeeps from local public buses, and dry-season access from monsoon transit challenges.

## 4. Domestic Mountain Flights and Weather Buffers

Mountain airstrips (Lukla, Jomsom, Juphal, Simikot) operate strictly under Visual Flight Rules (VFR) and are subject to abrupt morning fog, afternoon crosswinds, and seasonal cloud ceilings.

Our itineraries treat mountain flight schedules as weather-dependent windows, recommending mandatory 1–2 day contingency buffers before international departures. We actively document seasonal CAAN reroutings, including shifting Lukla flights from Kathmandu (KTM) to Ramechhap/Manthali (RCH).

## 5. Cost Transparency and Porter Welfare Standards

Cost guides separate mandatory statutory government fees (National Park entries, ACAP/MCAP permits, TIMS cards, Tibet Alien Travel Permits, Bhutan Sustainable Development Fees) from discretionary teahouse living expenses (meals, boiled water, device charging, Wi-Fi).

We endorse and benchmark ethical porter welfare standards under International Porter Protection Group (IPPG) and KEEP guidelines: maximum 20–25 kg load limits, adequate high-altitude cold-weather gear, fair local living wages, and comprehensive medical/rescue insurance.

## 6. Seasonal Weather and Climate Tendencies

Seasonal pages describe regional climate patterns and macro route tendencies (pre-monsoon spring, post-monsoon autumn, winter freeze, summer monsoon), not a short-term forecast for a specific departure date.

A seasonal climate description is never presented as a guarantee of clear skies, panoramic mountain visibility, or open passes. Travelers are advised to check real-time local forecasts upon arrival.

## 7. Verification Cycles and 'Last Verified' Integrity

Dynamic planning figures—fees, permits, regulations, transport hubs—are reviewed quarterly and ahead of the primary trekking seasons (March–May and September–November).

A 'Last verified' date signifies that all dynamic facts on the page were checked against responsible authorities near that date. Verification dates are never bumped for minor cosmetic edits or typographical corrections.

## Questions about this page

Why do trail walking times in guides differ from Google Maps?+
Google Maps does not account for high-altitude hypoxia, rugged boulder-strewn paths, steep stone stairs, or pack weight. Our trail hours come from actual guided trekking logs and represent realistic, safe mountain transit times.
How do you calculate the Sustainable Development Fee (SDF) for Bhutan?+
Bhutan's SDF is calculated strictly according to Department of Tourism Bhutan regulations: currently USD 100 per adult per night for international visitors (with 50% concession for children aged 6–12) and INR 1,200 per person per night for Indian passport holders.
What is the maximum weight a porter should carry?+
Under IPPG and KEEP ethical standards, porters must not carry more than 20 to 25 kg. Our itineraries and cost models fully respect ethical porter welfare.
Why do some prices appear as ranges rather than fixed numbers?+
Season, group size, transport mode, and exchange rates cause variations. Transparent ranges with stated inclusions help travelers evaluate quotations realistically.

This plain-English page is a description of the audited website and is not a substitute for jurisdiction-specific legal review.

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