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Garmin Hardware: Sensors, Displays and Materials Explained

Reference pages for the physical components inside Garmin watches: the optical heart rate sensor, GNSS chipsets, solar and display technology, battery engineering, and the glass or crystal covering the case. Where the site already has a deep-dive on a topic, this section links to it directly rather than repeating it. Select a topic below.

• Elevate Optical Heart Rate Sensor — every Elevate generation from the original 2015 sensor to the current Gen 5, what each one physically changed, what it can and cannot sense, and which watches use which generation.
• GNSS and Chipset Evolution — from single-band GPS to multi-band GNSS, the MediaTek to Sony to Airoha to Synaptics supplier history, and why tri-band hasn’t shipped yet.
• Solar Charging Technology — how Power Glass and Power Sapphire work, the Gen 1 to Gen 2 solar architecture change, and how reliable Garmin’s “unlimited” battery claims actually are.
• Battery Life and Power Management — the display, processor, and power architecture decisions that combine to produce Garmin’s longest battery figures, and why solar and AMOLED do not currently coexist.
• Case and Lens Materials — sapphire, Gorilla Glass, and Kunlun Glass compared by hardness and impact resistance. This piece covers the wearable market generally rather than Garmin alone.

Explore the full resource library

This site covers endurance sport technology across a range of dedicated reference sections. Each one collects the most relevant articles, tests, and analysis on its topic in one place.

Buyer guides

• Best sports watch: tested recommendations by sport and athlete type (triathlon, running, marathon, cycling, hiking, and women)
• Best Garmin watch: Forerunner versus Fenix by series, sport, and budget
• Best wearables: fitness trackers, recovery trackers, heart rate monitors, running power meters, and female athlete tech
• Best cycling products: computers, smart trainers, power meters, and cycling heart rate monitors
• Gear I use: the watches, bikes, sensors, fuel and sleep kit tfk actually trains and races with, and what his partner uses

Brand and product guides

• Amazfit: the full Amazfit range from Balance to Cheetah to T-Rex, accuracy tests, HYROX partnership, and Zepp Health analysis
• Apple Watch: athlete-first coverage of Apple Watch across running, cycling, and triathlon
• COROS: watches, features, and firmware across the full COROS range
• Garmin: the company, the platform and the full range, and the starting point for choosing across every Garmin product line
• Garmin Edge: bike computers from entry-level navigation to flagship endurance and mountain biking
• Garmin Fenix: every model, feature, and firmware development for Garmin's flagship outdoor watch
• Garmin Fenix 8 Series: which variant to buy, upgrade advice, accuracy data, and the full Fenix 8 review and firmware coverage
• Garmin Forerunner: the full Forerunner line covered from entry level to triathlon flagship
• Garmin Instinct: rugged GPS watches for endurance and adventure athletes
• Garmin Features Explained: how Garmin's metrics work, from Training Load and Body Battery to Race Predictor and HRV Status
• Google Fitbit: Fitbit Edge, Fitbit Air, Google Health, Pixel Watch and the Wear OS platform
• Polar: watches, sensors, Polar Flow and training science across the full Polar range
• Runna: coach-written running plans that adapt as you train
• Suunto: Race, Vertical, Run and the SuuntoPlus ecosystem
• Strava: features, privacy, segments, and how Strava fits into a serious training setup
• Ride with GPS: route planning, navigation and how it works alongside Strava
• Wahoo: KICKR trainers, ELEMNT bike computers, and the Wahoo ecosystem
• WHOOP: strain, recovery, sleep and the full WHOOP ecosystem

Specifications database

• Full Specifications Database: detailed spec sheets, battery life, sensor lists and generation-on-generation comparisons for current Garmin, COROS, Amazfit, Samsung, Google Fitbit, Huawei, Polar, Suunto, Wahoo and Apple Watch models

Glossary

• Sports Technology Glossary: non-branded terminology across running, cycling, swimming, triathlon, hiking, strength training, HYROX, sensors, ecosystems, and brands

Sport and topic guides

• Running Watches: how to choose by discipline (road racing, trail, track, beginner, and multisport)
• Triathlon and Multisport Technology: watches, sensors, and race-day tools for swimmers, cyclists, and runners
• HYROX: training science, race analysis, and technology for the functional fitness race format
• parkrun: technology, training, and performance for the weekly 5K
• Hiking Technology: navigation, safety, and trail tech for walkers and hikers
• Heart Rate Monitoring: optical sensors, chest straps, accuracy comparisons, and how to set training zones
• Optical Sensors (PPG): the 40 things a wrist optical sensor could measure, from heart rate to glucose, ranked by evidence
• GPS Accuracy: how satellite systems perform across brands, terrains, and conditions
• Sports Watch Battery Life: battery claims, real-world tests, and how to manage battery life across Garmin, Apple, Amazfit and COROS
• Recovery Trackers: WHOOP, Oura, and the science of readiness scoring
• Muscle Oxygen Sensors: SmO2 and NIRS explained, Train Red and Moxy compared, and the category from BSX and Humon to Garmin and WHOOP
• Female Athlete Tech: wearables, physiology, and performance for female endurance athletes, covering cycle-synced training, RED-S, HR accuracy, and VO2max
• Sports Science: peer-reviewed research on HRV, VO2max, lactate threshold, running power, wearable accuracy, and supplementation
• Testing Methodology: how this site tests GPS accuracy, heart rate, battery life, and other performance claims

Content series

• Release Radar: confirmed launches, leaks, and rumours across Garmin, Apple, COROS, Polar, Suunto, and Wahoo
• Deep Dive Feature Files: weekly firmware feature updates across all brands (bug fixes excluded)
• Fix Files: weekly firmware bug fix tracking across all brands