Watch, phone or instrument? Choosing a GPS tracker for watersports
A phone, a GPS watch and a marine instrument like Vakaros all record your session, but they suit different riders. Accuracy, battery, readability, safety and the app behind the device: what to compare before you choose.
By the Waterspeed team
Most GPS trackers can record a location. That is the baseline, not the deciding factor. On the water, movement is fast, conditions change quickly, and the difference between a useful session review and a vague activity record comes down to accuracy, sampling rate, sport-specific metrics, and how well the system works with the gear you already wear.
Here is how the three common options compare, and what to look for whichever you pick.
What a watersports tracker should do
The baseline is simple: record route, speed, time and distance accurately enough to trust. But for sailing, windsurfing, wingfoiling, kiting and paddling, useful tracking has to match how people actually move on the water:
- Reliable recording at a sampling rate that captures fast changes of speed and direction.
- Sport-specific metrics: best speeds over time and distance, tacks and gybes, foiling time, VMG, stroke data, depending on your discipline.
- A review that teaches you something: maps, comparisons between sessions, personal bests over time.
- Compatibility with the devices you trust.
- Safety features such as live location sharing.
Phone: the easiest place to start
A phone has a large screen, a strong processor and GPS that is good enough for a lot of use. You already own it, so the barrier is low.
On the water, the trade-offs show up quickly:
- Placement. Buried in a dry bag or a pocket against your body, it loses part of its view of the sky.
- Battery. Screen, background apps and heat all compete for power, and long sessions drain it fast.
- Access. It is hard to check live data mid-session.
- Safety. A phone can call and message, but only if it is dry, charged and reachable.
A phone is the better pick if you are new to tracking, your sessions are short, conditions are moderate and you mainly want a route and a rough speed. Use a secure waterproof pouch or armband.
GPS watch: the best fit for most regular riders
A watch is easy to strap on and stays with you. That alone means you track more sessions, which is what builds a useful history.
- Accuracy depends on the model generation more than the brand. Newer watches with multi-band GNSS and better antennas produce noticeably cleaner tracks.
- Battery in full GPS mode is usually enough for long sessions.
- Live data is a glance away: speed, distance, time.
- Your phone can stay dry on shore.
A watch is the better pick if you ride often, do long sessions or rough conditions, and want to see progress over time. Waterspeed works with Apple Watch, Garmin, COROS, Suunto and Wear OS.
Marine instrument: when live readability and racing matter
A dedicated instrument such as a Vakaros Atlas is built for the boat and for racing: precise GPS and motion sensors, a large readable display at speed, and start and countdown workflows designed for regattas.
- Readability at speed and in spray is far better than a watch face.
- Racing tools and on-water decision support are the core of the device, not an extra.
- Battery and mounting are designed for long days on the boat.
A smartwatch still wins on convenience, heart rate and everyday use. For many sailors the answer is both: the instrument on the boat for live decisions, the watch or app for logging and review. Vakaros sessions can be exported and imported into Waterspeed (VKX import on the web app and Android) for the post-session analysis.
Why the app matters as much as the device
Think of the device as the sensor, not the full solution. Raw GPS points become useful when the software understands watersports.
A generic fitness app answers one question: how much activity did you do? That is fine for duration, route and calories. But it sees distance and speed, not a tack, a gybe, a foiling run or an upwind leg. A watersports platform is built around speed, angle, transitions and conditions, so it can show where you lost speed, how consistent your manoeuvres were and whether a setup change worked.
When you compare apps, look at:
- Tracking quality with fast direction changes and long sessions.
- Performance metrics, not just route history.
- Device compatibility across watches and instruments.
- Safety and live awareness: live tracking and shareable location.
- Review and community: summaries, comparisons, personal bests, leaderboards, local activity.
Safety features need clear limits
Tracking improves awareness, but it does not replace judgment, weather checks, flotation, a communication plan or local knowledge. Live location only helps if the device has power, the signal reaches shore and someone knows how to respond.
How to choose
Start with the session you do most often:
- Short, casual sessions: your phone or the watch you already wear.
- Frequent riding and progression: a GPS watch with a watersports app.
- Racing, live decisions on the boat: a marine instrument, ideally combined with an app for review.
The best tracker is the one you will actually wear, charge and review. For the accuracy side, see How accurate is GPS on the water?.
