Garmin fēnix 8 Solar vs Garmin Instinct 3 AMOLED

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fēnix 8 Solar compared with Instinct 3 AMOLED

	Garminfēnix 8 Solar	GarminInstinct 3 AMOLED
Overview
Released
Released	August 2024	January 2025
Display
Case sizes
Case sizes	47 mm or 51 mm	45 mm or 50 mm
Panel
Panel	Memory-in-pixel	OLED
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	Always-visible sunlight-readable transflective colour memory-in-pixel (MIP) touchscreen, five leakproof inductive buttons. 47 mm: 33 mm (1.3 inch), 260 x 260 pixels. 51 mm: 35.56 mm (1.4 inch), 280 x 280 pixels.	45 mm has a 1.2-inch (30 mm) 390 x 390-pixel AMOLED display; 50 mm has a 1.3-inch (33 mm) 416 x 416-pixel AMOLED display; five-button controls, no touchscreen
Screen protection
Screen protection	Power Sapphire solar charging lens	Chemically strengthened glass
Health and fitness
ECG
ECG	Yes	No
Blood oxygen
Blood oxygen	Yes	Yes
Skin temperature
Skin temperature	Yes	No
Sleep apnoea alerts
Sleep apnoea alerts	No	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	No	No
Crash detection
Crash detection	No	No
GPS
GPS	Dual-band (L1 and L5)	Dual-band (L1 and L5)
Water resistance
Water resistance	100 m	100 m
Sensors
Sensors	GPS, GLONASS, Galileo, QZSS and BeiDou; SatIQ automatic multi-band selection; Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer, thermometer, ambient light and depth sensor to 40 m.	Garmin Elevate wrist heart rate; Pulse Ox; barometric altimeter; compass; gyroscope; accelerometer; thermometer
Health features
Health features	Garmin ECG App where regionally available with compatible phone and watch software; Pulse Ox availability varies by country. HRV status, Body Battery, health status/snapshot, skin temperature, sleep coach/score/alignment, breathing variations, nap detection, stress/respiration tracking, lifestyle logging, jet lag adviser and menstrual-cycle/pregnancy tracking. Current maker table includes smart wake alarm and past ovulation estimates.	HRV status; Body Battery; sleep score, sleep coach and naps; stress, respiration and abnormal heart-rate alerts; Health Snapshot; Pulse Ox availability varies by country; no ECG app
Fitness features
Fitness features	Training readiness/status, training load/focus/effect, endurance and hill scores, running tolerance, running power/dynamics, PacePro, ClimbPro, real-time stamina and recovery time. Running economy and step speed loss require a compatible accessory. Garmin running, cycling, strength and triathlon coaching. Scuba single-gas air/nitrox (21–40% oxygen) and apnea modes, EN 13319 depth sensor to 40 m; dive rating is distinct from 10 ATM surface water resistance. Golf, ski, climbing, cycling, swimming, multisport and strength activity profiles. Preloaded TopoActive maps on these Sapphire versions, downloadable regional maps over Wi-Fi, dynamic round-trip routing, NextFork, routes and turn-by-turn directions; golf and SkiView maps. Optional Outdoor Maps+ subscription adds premium maps. No need for a phone to follow stored maps/routes.	Training readiness and status; daily suggested running and cycling workouts; Garmin Coach; wrist running dynamics and power; PacePro; multisport and triathlon; breadcrumb navigation, TracBack and reference points; detailed maps available in paired Garmin Explore app, not as built-in watch maps
Safety features
Safety features	LED flashlight with white/red light and strobe. Incident detection, assistance, LiveTrack and live event sharing require a compatible paired phone and appropriate connectivity. Can control a separate compatible inReach device; LTE/satellite/SOS built into fēnix 8 Pro are not features of this Solar model.	Built-in white/red LED flashlight with strobe; incident detection during selected activities, assistance and LiveTrack require a paired compatible phone
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 30 days	Up to 24 days
In low-power mode
In low-power mode	Up to 48 days	Up to 30 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Storage
Storage	32 GB (better)	4 GB
Battery life detail
Battery life detail	Headline figures are 51 mm without solar: up to 30 days smartwatch and 48 days battery-saver watch mode. 47 mm: smartwatch 21 days/28 with solar; saver 34/58 days; GPS-only 67/92 h; all satellites 48/59 h on current UK web table (September 2026 owner guide instead says 49 h with solar); multi-band 37/43 h; all satellites plus music 13 h; maximum-battery GPS 132/283 h; expedition 34/58 days. 51 mm: smartwatch 30/48 days; saver 48/107 days; GPS-only 95/149 h; all satellites 68/92 h; multi-band 52/65 h; music 18 h; maximum-battery GPS 186/653 h; expedition 50/118 days. Solar watch/saver/expedition claims assume all-day wear with three hours daily outside at 50,000 lux; GPS solar claims assume use outside at 50,000 lux, with typical SatIQ use for multi-band. Actual battery life depends on enabled features.	Headline claims use the 50 mm version. 45 mm: smartwatch up to 18 days, 7 days always-on; battery saver 24 days; GPS only 32 hours; all systems 25 hours; all systems plus multi-band 23 hours; max battery GPS 68 hours; expedition GPS 16 days. 50 mm: smartwatch 24 days, 9 days always-on; battery saver 30 days; GPS only 40 hours; all systems 32 hours; all systems plus multi-band 30 hours; max battery GPS 86 hours; expedition GPS 20 days. Multi-band figures assume typical SatIQ use. No solar charging.
Charging
Charging	Garmin proprietary plug cable to USB-C computer port or AC adaptor rated at least 5 W, per current owner guide. Lithium-ion battery. Solar charging stops when fully charged or connected to external power.	Garmin proprietary plug charging/data cable
Connectivity
Connectivity	Bluetooth, ANT+ and Wi-Fi. Calls use a paired phone; offline watch voice commands and voice notes use the built-in microphone/speaker. Garmin Messenger requires a paired phone/app for ordinary messages. Garmin Pay with supported banks; downloaded local music or supported subscription music services; Connect IQ apps and Garmin Share.	Bluetooth and ANT+; GPS, GLONASS, Galileo, QZSS and BeiDou; multi-band and SatIQ; Garmin Pay; controls paired-phone music but does not store offline music; Garmin Messenger requires a paired phone
Design
Weight (lightest version)
Weight (lightest version)	80 g	53 g (better)
Software
Software	Garmin	Garmin
Case materials
Case materials	Titanium bezel (natural or Carbon Grey DLC), fibre-reinforced polymer case and metal rear cover; silicone band.	Fibre-reinforced polymer case and polymer/aluminium bezel; 10 ATM water rating; maker states MIL-STD-810 thermal and shock testing
Size
Size	47 mm: 47 x 47 x 15.2 mm. 51 mm: 51 x 51 x 15.4 mm. Silicone wrist fit: 125–208 mm (47 mm), 127–210 mm (51 mm). QuickFit 22 mm and 26 mm bands respectively. 47 mm 80 g with band, 57 g case only; 51 mm 95 g with band, 67 g case only. Headline weight describes 47 mm with supplied silicone band.	45 mm is 45 x 45 x 14.9 mm and 53 g; 50 mm is 50 x 50 x 14.4 mm and 59 g; maker does not identify these as case-only weights
Bands
Bands	–	45 mm uses QuickFit 22 mm and fits 137–204 mm wrists; 50 mm uses QuickFit 26 mm and fits 141–213 mm wrists
Colours
Colours	–	Current UK maker listings include Black, Citrine, Fern Green and Black/Bolt Blue combinations, depending on size; colours are cosmetic configurations
In the box
In the box	–	Instinct 3 AMOLED watch with silicone band; charging/data cable; documentation
Reference and release detail
Reference and release detail	Maker announced 27 August 2024; its Italian launch page states both Solar sizes were available that day. UK first shipping day is not independently established.	–