What are the differences between a GPS Unit and a GPS Watch?
When it comes to navigating the great outdoors, one of the most frequently asked questions we get here at GPS Training is: What’s the difference between a GPS unit and a GPS watch?
Both devices offer excellent support for walkers, runners, and outdoor adventurers, but they serve slightly different purposes. In this article (based on our video FAQ), we’ll break down the key differences and help you decide which is best for your adventures.
1. GPS Unit vs GPS Watch: The main differences
Screen size is the most obvious difference.
- A handheld GPS unit has a much larger screen, giving you a broader view of your route and surrounding terrain.
- A GPS watch has a compact display, which limits how much map detail you can see at once.
Battery life is another major factor.
- GPS units often last significantly longer – some models offer up to 180 hours of battery life.
- GPS watches usually last a couple of days with regular use, depending on the model and settings.
2. Can you use Ordnance Survey maps?
This is where the GPS unit really stands out.
- Handheld GPS units support full Ordnance Survey (OS) mapping at 1:25k and 1:50k scales. This gives you a detailed view of footpaths, contours, and landmarks – ideal for off-the-beaten-track walking. What do each of these map options look like?
- GPS watches, such as those from Garmin or COROS, do not support OS maps. Most use a simplified base map (like TopoActive) instead. While you can still plan your routes using OS mapping, what you see on the device is less detailed.
3. Ease of use: Which is simpler?
Surprisingly, GPS watches are generally easier to use.
- With a watch, it’s usually a case of pressing a button to start a course and away you go.
- GPS units take a little more getting used to, especially if you’re new to them. But once you understand the interface, they offer more features and flexibility.
Because watches are worn daily, users become more familiar with them over time – they’re on your wrist, always accessible, and double as a smartwatch.
4. Can you navigate with just one?
Yes – but with caveats.
- A GPS watch alone can be limiting due to its small screen. You’ll follow a line or arrow, and if you go off course, it’ll vibrate to alert you – but it won’t show you much else. It's manageable for simple or well-marked routes, but difficult in more complex terrain without a backup map.
- A GPS unit, on the other hand, can be used confidently as your sole navigation device, especially when paired with detailed OS maps.
5. What’s the navigation experience like?
- GPS watches typically navigate using courses or routes loaded via smartphone apps. They offer turn-by-turn instructions and off-course alerts, which are ideal for runners or ultra-distance events.
- GPS units give you more navigational options – routes, tracks, courses – and you can see a detailed OS map on a large screen. This is incredibly helpful if you want to choose your path on the go or make changes mid-walk.
6. Which is better value for money?
Interestingly, GPS units often provide better value, especially when you factor in Ordnance Survey mapping.
- For example, a high-end GPS unit with full OS mapping may cost less than a top-tier GPS watch without it.
- But don’t forget – watches also double as fitness trackers and smartwatches, offering health stats, notifications, and more.
It really depends on your priorities.
7. What activities suit each device?
Use a GPS watch for:
- Races or ultra-events (especially waymarked ones)
- Long-distance pre-planned routes
- Fitness tracking and day-to-day wear
Use a GPS unit for:
- Day walks in the hills
- Planning your own route (e.g. path to bridleway to footpath)
- Navigating unfamiliar or complex terrain with confidence
Summary: Which should you choose?
- Choose a GPS unit if you want reliable, detailed navigation with OS maps, especially for hill walking, route planning, or exploring unknown paths.
- Choose a GPS watch if you’re racing, training, or want a compact, easy-to-use device that fits into your daily routine.
Still not sure? At GPS Training, we offer expert advice, comparison articles, and in-depth training to help you find the right device for your needs. Watch the full video above for a detailed breakdown and get in touch with us if you need personalised help.
Further reading
1. Which is best - GPS unit or watch
2. Walk and talk - let me take you on a walk with a GPS unit or GPS watch
PaulB
I have this issue that the watch needs to be on the wrist to use it kayaking or other paddlesports. I sometimes think it would be best to have the watch buried under your drycag and to connect it to another device to see the data from it combined with say the GPS date on the outer device. It would be good if Garmin GPS watches and Garmin GPS units shared data in real time so you can combine the two advantages of activity tracking with HRM and other personal metrics with a handheld GPS unit.
I have an old Garmin GPS25 bike head unit and that did it in a basic way. The higher end bike GPS units do it better. Why don’t traditional outdoor GPS units units do this too especially since the tech is there already with bike head units??
Colin Fisher
One very important factor especially in the UK that I have found is that in the cold and rain my GPS watch is tucked under at least 2 layers of tight waterproof and warm clothing. Trying to extract a watch from underneath all that lot I have found impossible and if I only have my watch with me, i.e. I’m not trail blazing someplace, I will take the watch off and keep it in an easily accessible pocket.