# Ultra-Go: Scientific Ultramarathon Race Strategy, Nutrition Engine & Crew App

> Master Your Ultra Race. Scientific race strategy, weather-adaptive hydration engine, gut fatigue decay modeling, osmolality safety warnings, drop bag manifests, and live crew sync.

## Overview & Purpose
Ultra-Go is a specialized mobile app engineered specifically for ultra-distance runners (50km, 50 miles, 100km, 100 miles, 200+ miles, FKTs, and multi-day stage races such as UTMB, Western States 100, Leadville 100, and Hardrock 100). Unlike standard GPS tracking applications, Ultra-Go models the complex physiological, environmental, and logistical realities of long-distance endurance racing.

## Primary Capabilities & Scientific Algorithms

### 1. Dynamic Pacing & Weather Adaptation
* **GPX Elevation Parser**: Automatically calculates distances, grade-adjusted effort, elevation gain/loss, and aid station split times from `.gpx` course uploads.
* **Effort Pacing Engine**: Allows runners to adjust segment pacing according to gradient, altitude, terrain, and effort sliders.
* **Weather-Adaptive Hydration**: Real-time ambient temperature (°C / °F) and relative humidity (%) algorithms scale hourly fluid and sodium requirements to prevent dehydration and hyponatremia.
* **Race & Course Catalog**: Global community race repository plus custom course submission capabilities.

### 2. Scientific Fuel Engine & Nutrition Pantry
* **Comprehensive Macro/Micro Pantry**: Itemized database for gels, chews, drink mixes, solid foods, capsules, and electrolytes tracking Energy (kcal), Carbs (g), Sodium (mg), Caffeine (mg), Potassium, Calcium, and Magnesium.
* **Gut Fatigue Decay Model**: Simulates gastrointestinal carbohydrate absorption decay over extended racing duration (modeling a 2%/hr taper after 15 hours of continuous effort).
* **Osmolality & Hypertonicity Safety Warnings**: Evaluates fuel concentration against fluid carried to trigger GI distress warnings when carb density exceeds stomach absorption limits.
* **Targeted Caffeine Strategy**: Calculates optimal caffeine intake windows in the final 30% of races to maximize alertness without GI upset.
* **Intake Simulator**: Hourly sandbox to test custom fueling strategy against baseline requirements.

### 3. Live Crew Coordination & Handoffs
* **Crew Mode Sync**: Generates a secure invitation code enabling crew members to track real-time split ETAs, drop bag manifests, station checklist requirements, and viewpoint GPS directions on their own devices.
* **Offline PDF Race Book Export**: Export complete race execution plans for offline access in remote mountain areas without cell coverage.

### 4. Runner Profile & Privacy Architecture
* **Physiological Sweat & Baseline Model**: Tailors recommendations based on body weight, sex, sweat rate categories (Light to Very Heavy), salt loss concentrations (Low, Med, High), and gut training level (45g/h, 65g/h, 85g/h+). Lab test data overrides available.
* **Local-First Privacy**: Physiological data and custom race strategies are stored locally on-device.

## Links & Documentation
- [Home & Waitlist](https://ultrago.app/)
- [Full Technical LLM Guide](https://ultrago.app/llms-full.txt)
- [Privacy Policy](https://ultrago.app/privacy.html)
- [Terms of Use](https://ultrago.app/terms.html)
- [Support](https://ultrago.app/support.html)