Great GPS functionality - locks on quickly. Suunto coach comes free with the app and has AI training plans, so, you don’t have to subscribe to such things separately. Battery life is great.
Review - Garmin Fenix 8 Solar - 51mm
Garmin Fenix 8 Solar - 51mm Review
Our Analysis and Test Results
The Garmin Fenix 8 Solar - 51mm is a powerhouse designed for endurance athletes, outdoor adventurers, and those who demand top-tier GPS performance and durability. It builds upon its predecessors with improved solar charging, enhanced GPS accuracy, and longer battery life, all while maintaining the rugged and premium build quality that defines the Fenix lineup.
Here at the Outdoor GPS Shop we have sold and used this watch from the day it was launched in August 2024.
Garmin continues to differentiate the MIP (Memory-In-Pixel) display variant from its AMOLED counterparts, ensuring maximum efficiency in sunlight and extending battery life to impressive levels.
If your priority is reliability in extreme environments, superior battery life, and topographical mapping capabilities, the Fenix 8 Solar is an excellent investment.
Performance Comparison
GPS & Sensor Accuracy
The dual-frequency GNSS (Multi-Band GPS) provides exceptional accuracy in all terrains, from dense forests to deep canyons.
In real life testing against a precisely measured 2.8-mile reference route, the Fenix 8 Solar recorded 2.74 miles, showing minimal deviation of just 0.06 miles. This is one of the most accurate performances we’ve seen in a GPS watch.
For heart rate accuracy, we compared it against the Polar chest strap, a gold standard in heart rate measurement. The Fenix 8 Solar maintained a ±1.46 BPM deviation, demonstrating high precision even during high-intensity workouts.
Additionally, the watch includes an ECG sensor, Pulse Ox (SpO2) monitoring, respiration tracking, and advanced HRV analysis, making it a top-tier choice for endurance athletes looking to optimize performance and recovery.
Activity Tracking & Multi-Sport Performance
The Fenix 8 Solar - 51mm is built for serious athletes with its extensive sports modes, tracking everything from running and cycling to mountaineering, skiing, and ultra-endurance events.
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Running & Trail Running: The Fenix 8 Solar features advanced running dynamics, including ground contact time, vertical oscillation, stride length, and real-time stamina tracking. For trail runners, turn-by-turn navigation and ClimbPro ascent tracking provide key insights into elevation gains and pacing.
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Cycling & Mountain Biking: The watch integrates seamlessly with Garmin Edge GPS units, supports cycling power meters, and includes MTB-specific dynamics such as jump detection, flow rating, and grit score.
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Hiking & Mountaineering: With preloaded TOPO maps, next-gen breadcrumb navigation, and detailed route planning, the Fenix 8 Solar is perfect for backcountry adventurers.
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Swimming & Triathlon: The 5ATM water resistance, stroke tracking, and open-water GPS mode make it an excellent choice for swimmers and triathletes.
- Skiing & Snowboarding: The watch includes preloaded ski maps and avalanche risk alerts.
With over 100 activity profiles, there is no doubt that the Fenix 8 Solar is one of the most versatile multi-sport watches on the market.
Smartwatch Features & Everyday Use
Beyond sports, the Fenix 8 Solar functions as a full-featured smartwatch.
- Garmin Pay for contactless payments
- Music storage & streaming (Spotify, Amazon Music, Deezer)
- Smart notifications (read and reply to texts, take calls when connected to a phone)
- Garmin Connect IQ App Store for additional apps & widgets
Garmin’s redesigned UI makes it easier to navigate key insights on sleep tracking, stress monitoring, body battery energy tracking, and recovery time analysis.
Solar Charging & Battery Life
One of the biggest advantages of the Fenix 8 Solar is its outstanding battery performance:
- Standard GPS Mode: Up to 66 hours (expandable to 92 hours with solar charging)
- Expedition Mode: More than 2 months with solar input
- Smartwatch Mode: Up to 30 days per charge
In real-world conditions, we found that with moderate GPS use, solar charging easily extends battery life by 20-30%, making it an ideal watch for ultra-runners and long-distance adventurers.
Rugged Design & Build Quality
The 51mm case size provides a larger display and enhanced durability, featuring:
- Sapphire lens (scratch-resistant and ultra-durable)
- Titanium case (lightweight yet rugged)
- QuickFit bands (easily interchangeable, compatible with older Fenix models)
- 5ATM water resistance (suitable for swimming, heavy rain, and extreme conditions)
The watch’s built-in LED flashlight is a game-changer for night navigation and emergency situations, making it a unique feature that Garmin continues to perfect.
Navigation & Mapping
Garmin’s top-tier mapping features are one of the standout reasons to invest in the Fenix 8 Solar:
- Preloaded TopoActive Maps (Europe, US, and global regions available for download)
- Turn-by-Turn Navigation (like a GPS device, but on your wrist)
- ClimbPro Ascent Planner (perfect for mountaineering and hiking)
- Real-Time Breadcrumb Trail (ensuring you never get lost)
The multi-band GPS ensures precision in remote locations, making it a top choice for expedition-level adventures.
Should You Buy the Garmin Fenix 8 Solar?
If you’re looking for the most durable, feature-packed, and longest-lasting GPS watch on the market, the Garmin Fenix 8 Solar - 51mm is a phenomenal choice.
Who Should Buy It?
✅ Ultra-Runners & Endurance Athletes – Outstanding battery life, multi-band GPS, and real-time stamina tracking.
✅ Hikers, Backpackers & Mountaineers – Topo maps, ClimbPro, weather forecasting, and turn-by-turn navigation.
✅ Cyclists & Triathletes – Power meter compatibility, VO2 max tracking, and interval training support.
✅ Adventurers & Expedition Travelers – Unmatched durability, emergency features, and solar charging capabilities.
Who Might Want to Look Elsewhere?
❌ Casual Athletes – If you don’t need all the advanced features, a Forerunner 965 or Instinct 2X Solar may be a better fit.
❌ Budget-Conscious Users – The Suunto Vertical Titanium Solar offers similar battery performance at a lower cost.
❌ Those Who Prefer AMOLED Displays – Consider the Garmin Fenix 8 - 51mm Amoled Sapphire if screen brightness and vibrancy are a priority.
Final Verdict
The Garmin Fenix 8 Solar - 51mm is arguably the best adventure GPS watch available today. With exceptional GPS accuracy, best-in-class solar battery life, detailed mapping, and rugged durability, it is an outstanding investment for serious athletes and outdoor enthusiasts.
If you want the most reliable GPS watch money can buy, this is it. Highly recommended.
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Customer Reviews
Overall rating: 4.7 / 5 from 485 reviews.
I bought the GPSMAP H1 online but picked it up from the Office in Northumberland as I was on holiday in the area a few days after I ordered it. I spoke with Jon, a really helpful and friendly guy. The staff at the office were good too. This device is really great. It came with some helpful documentation printed off by the shop. To get the best out of it use Garmin express and Garmin base map on either a Mac or a Windows computer. However, setting up your own courses on screen is fairly simple too. The preloaded maps are perfectly good, but if you want Ordnance survey maps there's a slot for an SD card. You can switch the touch screen off which is dead handy if you want to keep it in your pack or pocket whilst walking. The pictures I have attached show a course I did on screen. Also a bearing on the Humber Bridge. Apols for the quality but I needed three hands really. Overall I'm delighted. It's a complex thing so if you haven't had one before, take a couple of hours to mess about with it before going out and field test it on a walk you're familiar with.
Its not fit Dezl lgv1000
very good and prompt service.
Garmin Bike mount for the New GPSMap H Series & NEW eTrex Touch
Great device. A big improvement over the 67i No issues so far, feels nice & tough. Touchscreen is a bonus.
Bought the H1 GPS with the additional 1.5 maps . Arrived all checked over with card installed and set up for me. Thanks guys. Delivery was fast , works great straight out the box and can’t fault the service. The H1 works great after familiarise myself around the menu options. Took it out with me, for a test on a local walk. After I’d loaded up a route into it from Garmin explore app. Works great, very impressed with the touch screen feature . Added a screen protector and silicon soft case, for some extra protection . 😊
I had a Montana before this which was good but this is much better in that it has buttons and it’s more compact. The service from Outdoor GPS is also worth a mention as they were outstanding.
My daily cycling routine involves 32km, and these Suunto Wing 2 have significantly improved my rides. I enjoy listening to music while staying aware of traffic. The lights are a fantastic feature for evening rides. They also perform well in strong winds. Overall, I love them.
Very happy with my purchase! It comes setting up straight from the box and with lots of useful information and paperwork. The person who answered on the phone was friendly and helpful. 100% recommend!
Upgraded to the Amoled version and can't believe how good the screen is, thanks for great watch at a super price.
Excellent service from start to finish. Very responsive to my questions and clearly knowledgeable about the product. They took the time to explain things properly rather than giving rushed answers, which gave me confidence in the purchase. Delivery was smooth and everything arrived exactly as described. Would definitely use them again.
Brilliant. Works perfectly with my Garmin 610👌
This satcoms navigation works perfectly, exactly what I needed.
Great service and fast delivery - highly recommended.
Great service and awesome product
Lovely large screen to view and so many different activities to track. Excellent analysis after each activity which can be accessed on my phone or iPad and I can compare stats for same routes. Still getting used to all the functions to make the best of everything.
Delivered in good time ready to go.
Fab watch.
From start to finish I cannot fault Outdoor GPS Shop. Great price and great communication. I love my watch, it is packed with features and is well made. I will definitely be back for my next one, though hopefully this will last me a while. Cheers
Reviewed various GPS units and wanted the extra confidence whilst out solo in the fells to be able to communicate with family. This ticks all the boxes.
Loving the Garmin GPSMAP67, I could not believe anything could have suck good battery life, Wow!
First use today on a 58 cycle ride. Love it, much clearer screen then the 600 it has replaced. Map updates were a challenge as they were not visible after update. Had to uninstall and reinstall to fix the problem.
Replaced my Garmin 600 bike mount with this very similar 700 version. Should last a good 10 years like the last one.
Replaced Garmin Montana 700 series. Like the big screen but chunky and heavy.
Great service
Watch is superb with a great battery life. Watch was delivered quickly and arrived next securely wrapped and was at a very competitive price. Highly recommended !
I was not very happy with the detail of the 1:50k maps, so I upgraded to the 1:25k. Even though it is much more expensive I am very glad I did, as I am a bit "OCD" about detail. The detail of the 1:25k shows things as they actually would appear from the air, rather than just the vague blobs reproduced by the 1:50k. I suppose it depends on what you want and what you use the maps for - I like the better accuracy of the 1:25k which I feel is more trustworthy and gives me a better feel of where I am, and what I can expect to see both of my surroundings and on the ground.
I initially found this difficult to get to grips with, the problem being that I've been used to using a Dakota 20 for the last 10 years. However, now that I've had it outside and used it in anger, I must say its a big step up! I've spent some time setting it up as I want it (in some regard similar to the Dak20) but it's so customise- able, it just took time to work it out. Reading the manual was a big help!! I use Memory Map to upload my traces and the GPS 67 doesn't interface with it in the same that the Dakota did, which was a bit of a curve ball for me at first. It turns out though that the solution is just different not worse. All in all, now that I'm a bit more used to it I like it a lot. I'd have to say that I highly recommend this unit.
fast delivery, item is very good quality
Great
Great service - the Inreach mini 3 arrived really quickly. I’ve only managed to use it once but it was great and I was able to keep in touch with my partner while I was out hiking. Will keep on playing with it as I’m going to use it in Nepal 🇳🇵 in November.
Great service. Prompt delivery with regular updates. The product is perfect after some early mistakes (Garmin your instructions are poor and it’s 3rd party YouTube that gets you sorted) it’s ideal for my needs in the Scottish Borders on my own with my Falcons miles from Signal.
Gift to my son for his 21st birthday in March. Never off his wrist and no issues. He absolutely loves it.
Bit apprehensive with the cost but after getting one don't know how i on without one. Easy to use and learn just clicking buttons and screen soon learnt how to use it
Very sound construction, fits securely, holds my MONTANA 700 GPS perfectly, mounted on a Triumph Thunderbird 900, covered 200 miles on a variety of road surfaces and a few potholes all without incident, am really pleased with it.
Garmin Montana 700 – Motorcycle Mount Kit and AMPS Rugged Mount with Audio/Power Cable
It does what I want
Too early to put it through it's paces>
works well
The Garmin 65s is a reliable workhorse of a GPS. I’ve used earlier models and I’m glad to say this one is still very robust and simple to use, once you’ve spent a bit of time playing around. It’s currently earning its keep in the far north of the Nordic region, in pretty wet and rugged conditions. The service from Outdoor GPS Shop was second to none. Highly recommended.
Great watch and pricing and communication was excellent.