Sailing Analytics and GPS Tracking Apps Compared

Ten years ago, reviewing a race meant sitting in the club bar trying to remember which way the wind shifted on the second beat. Today most competitive sailors carry a GPS logger in their pocket and a fair number of them have their entire season's data sitting in an app somewhere, mostly unread. The tools for capturing that data have gotten very good. The tools for turning it into something you actually learn from vary enormously, and picking the wrong one usually means you record a season of tracks and never look at them again.

This post walks through the main sailing analytics and GPS tracking platforms available today, what each one is generally understood to be built for, and where they seem to fit best. It includes SailingMetrics, because we built it and because it's genuinely one of the more complete options for club and dinghy racing, but the goal here is to give you a fair picture of the whole landscape based on publicly available information, so you can pick the right tool for how you actually sail rather than just the one with the flashiest homepage. Feature sets and pricing change, so it's worth checking each provider's own site for the current details before you commit.

Why this comparison is harder than it looks

Sailing analytics is a strange little corner of the software world. The market is small, the sailors who need it most are often the least willing to pay for it, and the underlying problem, turning a stream of GPS coordinates into something useful, sounds simple but isn't. A raw GPS track is just a list of positions and timestamps. Getting from that to "you lost four boat lengths at the top mark because you didn't ease the vang early enough" requires speed smoothing, tack and gybe detection, wind estimation, leg segmentation, and usually some way of comparing your track against either your own history or somebody else's.

Because of that complexity, the tools in this space tend to specialise. Some are built purely for replay: you upload a track, you watch an animation, you argue about the cross at the pin end. Others are built for live event coverage, so spectators on shore can watch a fleet race in real time. A few are built for offshore routing and performance modelling on much bigger boats, where the questions are about polar targets and weather routing rather than tacking angles. And a smaller number try to do the whole job: recording, analysis, training, and some kind of competitive or social layer that gives you a reason to keep uploading your sessions.

Knowing which category a tool falls into before you start comparing feature lists will save you a lot of time. A tool that's brilliant for offshore routing will be frustrating for dinghy tacking analysis, and vice versa.

What actually matters when choosing a sailing analytics tool

Before getting into individual platforms, it's worth being specific about what separates a genuinely useful tool from one that just produces pretty charts nobody looks at twice.

• Sample rate and accuracy. A phone GPS sampling once a second is fine for a rough replay but not accurate enough to see the small speed changes that matter in a tack. Dedicated GPS loggers sampling at 5 to 10 Hz, or phone sensor fusion that blends GPS with the accelerometer and gyroscope, give you a much cleaner picture.
• How much friction there is between sailing and seeing your data. If uploading a session takes fifteen minutes of file wrangling, most people stop doing it within a month. The tools that get used long term are the ones where recording and uploading happen almost automatically.
• Whether the analysis answers a question you actually have. "Your average speed was 4.2 knots" is not useful. "You were 0.3 knots slow through tacks compared to your last five sessions" is useful.
• Video, or the lack of it. Numbers tell you what happened. Video tells you why. A tool that syncs GPS data to onboard video closes the gap between the data and the sailing itself.
• Whether there's a reason to keep coming back. This is the one people underestimate. A recording app with no competitive or social context is easy to abandon. A platform where your sessions feed into a ranking, a league, or a series result gives you an ongoing reason to keep tracking.
• Cost and who it's actually built for. A lot of the tools in this space were built for offshore or big boat racing and then marketed more broadly. Dinghy and club sailors have different needs and usually a much smaller budget, so it's worth being clear about who a tool was actually designed for.

How much does GPS accuracy actually matter

It's worth spending a moment on this because it explains a lot of the differences between the tools below. A phone's built in GPS chip typically updates once per second and has a horizontal accuracy of somewhere between three and ten metres depending on satellite geometry and how much sky it can see. For a full race replay, that's plenty. You can watch two boats round a mark and see who got there first without any trouble.

Where it starts to matter is in short duration events like a tack or a gybe, which typically last two to four seconds. At one sample per second, a tack is represented by perhaps three or four data points, which is barely enough to see that your speed dropped, let alone understand the shape of the speed loss and recovery. Dedicated GPS loggers and modern phone apps that fuse GPS with the accelerometer and gyroscope can sample at 5 to 10 Hz, giving you twenty to forty data points across the same manoeuvre. That's the difference between a rough sketch of a tack and something you can actually coach from.

Heel angle and heading are the other two data points that separate a basic GPS track from something genuinely useful for technique work. A phone's GPS alone can't tell you how far the boat was heeled during a gust or whether you were pointing where you thought you were. That's why hardware with an onboard inertial measurement unit, like the Vakaros Atlas, or a phone app that uses the device's own motion sensors alongside GPS, gives you a noticeably richer picture than GPS position alone.

None of this means you need to buy dedicated hardware before you start. A phone recording at a reasonable rate is a perfectly good starting point and will teach you plenty about your racing. It just explains why some tools feel like they're telling you something you didn't already know, and others feel like they're just drawing your track on a map.

Platform by platform

With that in mind, here is how the main platforms stack up.

SailingMetrics

SailingMetrics is built specifically for competitive dinghy and small keelboat sailors, and the thing that separates it from most of the field is that it isn't just a recording and replay tool. It's a full performance platform that connects individual session data to a live competitive structure.

The Android app records GPS tracks and video at the same time, so you get your speed, heading, and VMG data synced against footage of what your boat and body were actually doing. That combination matters more than it sounds. Watching a chart tell you that you slowed down mid tack is one thing. Watching the video of that same tack while the chart plays underneath it, seeing that you were late to hike or that the boom caught the water, is a completely different level of understanding. Very few tools in this space offer that kind of synced video and telemetry, and the ones that do tend to be built around expensive professional keelboat instrument systems, not club dinghies.

Beyond the recording and video side, the analysis itself covers the things that actually change how you sail:

• Automatic tack and gybe detection with speed, VMG, and heel angle around each manoeuvre
• Leg by leg performance breakdowns so you can see exactly where time was gained or lost on the course
• Wind angle and polar style analysis comparing your upwind and downwind angles across sessions
• Live audio callouts so you can hear your speed and heading while racing without looking down at a screen
• A dedicated tacking training mode with structured drills and instant feedback on each tack, useful for solo practice sessions rather than just races
• Support for dedicated GPS hardware, including Vakaros Atlas VKX files, so if you already own a Bluetooth logger you get the full 10 Hz data rather than a lower resolution export

Where SailingMetrics really separates itself from a pure analysis tool is the competitive layer sitting on top of all this. The platform includes full competition and regatta management, so clubs can run an entire series, manage entries, apply handicap systems, and publish results without a spreadsheet. There's also the SailingMetrics League, a decentralised, handicap based competition that's free to enter and open to sailors anywhere in the world, and a skipper ranking system that shows where you stand against other sailors in the community. None of that is cosmetic. It's the difference between a tool you use once after a big regatta and one you use every single time you go afloat, because your training sessions and club races both feed into something ongoing.

The honest limitation is scope. SailingMetrics is built around dinghy and club level racing and training, so if you're doing offshore passage racing with a navigator plotting weather routes three days out, it isn't the tool for that job, and it doesn't try to be. For the audience it's aimed at, club and dinghy racers who want to actually improve and who like having some competitive context around their sailing, it's the most complete option available right now.

Download the SailingMetrics app or create a free account to see what your last session actually looked like.

RaceQs

RaceQs is one of the longest running names in this space and it's still one of the best free options if what you mainly want is a post race replay. You and your fleet record tracks independently on your phones, upload them afterwards, and RaceQs stitches them together into an animated 3D replay you can rotate, zoom, and scrub through like a video.

The replay quality is genuinely good and it's popular for exactly the reason you'd expect: it's free, it works across different phone brands within the same fleet, and it's simple enough that a whole club can use it without anyone needing to read instructions. It's primarily a replay tool though, and as far as we're aware it doesn't go much beyond that into detailed tacking analysis, structured training features, or an ongoing competitive structure. It answers "what happened" well, and if you want a tool that also digs into "why" and "how do I get faster," it may feel a bit light on its own.

• Free 3D animated replays with the whole fleet overlaid
• Works well for group debriefs after a race
• Wide adoption at club level, so it's easy to get a fleet using it together
• Primarily focused on replay rather than deeper performance analysis, based on what's publicly available

If your only need is a shared replay for a Sunday debrief, RaceQs does that job and costs nothing. If you want to go further and actually work on your speed and tacking over time, it's worth also looking at tools built specifically for that.

TackTracker

TackTracker has a smaller but loyal following among sailors who care specifically about tack and gybe timing. It detects manoeuvres automatically and gives you leg by leg timing data, which makes it a reasonable middle ground between a pure replay tool like RaceQs and a full platform like SailingMetrics.

Some sailors find the interface less modern than newer apps, though that's a matter of taste, and the underlying tack timing analysis is the main draw. As far as we're aware, it doesn't offer video sync, live audio feedback, or competition management features, so it sits in a fairly specific niche focused on manoeuvre timing.

• Automatic tack and gybe detection with timing breakdowns
• Fleet replay with basic performance comparison
• Free and paid tiers
• No video integration that we're aware of

Worth a look if you want detailed manoeuvre timing without paying for a broader platform, but check its current feature set directly if video or training tools matter to you.

Kwindoo

Kwindoo is built primarily for live event tracking rather than personal performance analysis, and it's genuinely good at that job. Race organisers use it to give spectators and shore based supporters a real time view of where boats are on the course, which is a different problem from helping an individual sailor get faster.

If your club runs bigger regattas and wants to offer live tracking to family, sponsors, or a wider audience, Kwindoo is worth evaluating. It's built around live event coverage rather than individual training, so if your main goal is improving your own performance session by session, it's likely not the best fit for that specific job, though it does offer some replay functionality alongside its live tracking.

• Strong live tracking built for spectators and event organisers
• Photo and video integration during live events
• Popular choice for regatta organisation at club and national level
• Built around events rather than individual training analysis

eStela

eStela has more traction in offshore and coastal racing than in dinghy fleets, and it shows in the feature set. It offers live tracking for events along with post race replay, start line analysis, and mark rounding breakdowns, which suits bigger boat racing and passage races better than short course dinghy sailing.

If you're doing offshore or coastal racing and want live tracking combined with some post race analysis, it's worth a look. Since its adoption seems concentrated in offshore and coastal events, dinghy sailors hoping to compare against a wide field of similar boats may find better critical mass with a platform more focused on dinghy racing specifically.

Expedition

Expedition sits in a different category entirely. It's professional grade navigation and performance software with a strong reputation in offshore and grand prix racing circles, well equipped offshore keelboats and campaigns that need weather routing and detailed polar performance modelling. It handles that side of the sport at a level far beyond anything built for dinghy sailing.

It's a PC based tool that expects a proper instrument system feeding it boat speed, wind, and navigation data, and the learning curve and pricing both reflect a professional offshore audience rather than a club dinghy sailor. If you're campaigning an offshore boat with a full instrument suite and need weather routing and performance modelling, it's worth serious consideration. If you sail a Laser or an RS200, it's solving a problem you don't have.

• Advanced weather routing and polar performance modelling
• Deep instrument integration for boats with a full navigation suite
• Well regarded in offshore and grand prix racing
• Priced and built for a professional offshore audience, not dinghy or club sailors

Sailmon and Velocitek: hardware plus app ecosystems

Sailmon and Velocitek both sell dedicated onboard instrument hardware, GPS speed pucks and small displays, paired with their own companion apps for post session review. The instruments themselves are excellent, sampling at high rates with good accuracy, and if you're already invested in one of these hardware ecosystems the companion apps give you a reasonable analysis layer on top.

The catch is cost of entry. You're buying dedicated hardware before you get to the software side at all, and that's a meaningfully bigger upfront cost than downloading an app. The analysis tools themselves also tend to be simpler than a dedicated platform like SailingMetrics or TackTracker, since the primary product is the hardware and the app is there to support it rather than being the main event. If you already own one of these units, it's worth using the companion app, but buying the hardware purely for the analysis software isn't the most cost effective route into GPS analysis.

• High accuracy dedicated GPS hardware
• Companion apps for post session review
• Significant upfront hardware cost
• Software feature set is secondary to the hardware product

Vakaros Atlas

Vakaros makes the Atlas and Atlas Edge, small Bluetooth GPS loggers built specifically for racing sailors, with a start line countdown display that's genuinely useful on its own. The units record at up to 10 Hz and capture heel and heading data from an onboard IMU in addition to position, which is a meaningfully richer dataset than a phone GPS on its own.

The unit's own app gives you basic replay and timing, but where it gets more interesting is that platforms like SailingMetrics now support the native VKX file format directly, so you can use the Atlas as your recording hardware on the water and get the full resolution data into a proper analysis platform afterwards rather than being limited to a GPX export. If you already like the Atlas as a start line tool, pairing it with a fuller analysis platform gets you the best of both without having to choose one over the other.

• Purpose built start line countdown display, popular on its own merits
• 10 Hz GPS with heel and heading from onboard sensors
• Native file format now supported by some analysis platforms, including SailingMetrics
• Basic analysis in its own app, better paired with a dedicated platform

SAP Sailing Analytics and TracTrac

At the very top of the sport, events like the America's Cup and major championship regattas use professional grade tracking systems such as SAP Sailing Analytics and TracTrac. These are built for broadcast graphics, real time spectator apps, and race committee tools at a scale and budget that has nothing to do with club racing. They're mentioned here mainly for completeness, since they occasionally get name checked in sailing media, but they aren't something an individual sailor or even most clubs would use directly. If you've watched America's Cup coverage with live boat speeds and virtual course boundaries overlaid on the water, that's the kind of system doing the work behind the scenes.

Matching the tool to how you actually sail

Rather than picking a single winner, it's more useful to think about which category of sailor you are.

If you race a dinghy or small keelboat at club level and want to genuinely improve, not just see a replay but understand your speed, tacking, and decision making over time, SailingMetrics is built for exactly that. The combination of synced video, tack detection, training tools, and a competitive structure that gives your data ongoing purpose is hard to find anywhere else at this level.

If all you want is a free shared replay to argue about after Sunday racing, RaceQs remains a solid choice and it costs nothing to try.

If tack and gybe timing is your specific focus and you don't need video or a training mode, TackTracker is worth a look.

If you're organising events and want to give spectators or sponsors a live view of the fleet, Kwindoo or eStela depending on whether you're closer to dinghy or offshore racing, are built specifically for that job.

If you're campaigning an offshore boat with a full instrument suite and need weather routing and polar performance work, Expedition is close to the professional standard, with a price and learning curve to match.

If you already own dedicated hardware from Sailmon, Velocitek, or a Vakaros Atlas, use the companion tools you already have, and if you're on an Atlas specifically, check whether your analysis platform of choice supports the native VKX format so you're not losing resolution along the way.

A note on price

It's worth saying plainly that a lot of the professional and offshore tools in this space are priced for people running well funded campaigns, not for a sailor with a road trailer and a club membership. Expedition licensing, dedicated hardware from Sailmon or Velocitek, and event level systems like SAP Sailing Analytics or TracTrac are simply not aimed at club and dinghy sailors, and comparing their price to a free app isn't really a fair fight because they're solving different problems for different budgets.

Among the tools actually built for club and dinghy sailors, most of the meaningful analysis features on SailingMetrics are available for free, with some pro features available for a modest subscription. RaceQs is free. TackTracker has free and paid tiers. The good news for most readers of this post is that the tools genuinely relevant to your sailing are also the most accessible ones.

Common questions

Do I need a dedicated GPS logger, or is a phone good enough? A phone is a perfectly good starting point. You'll get a full race replay and reasonable speed data. If you find yourself wanting more detail around tacks and gybes specifically, that's when a dedicated logger sampling at a higher rate, or a platform that fuses phone sensor data more intelligently, starts to pay off.

Can I use more than one of these tools together? Yes, and plenty of sailors do. It's common to use a Vakaros Atlas as a start line timer and recording device on the water, then upload the resulting file into a fuller analysis platform afterwards. Hardware and analysis software don't have to come from the same company.

Does video actually make a difference, or is it a nice to have? It makes a bigger difference than most sailors expect before they try it. Numbers can tell you a tack was slow. Video tells you why it was slow, whether that's a late hike, a stalled sail, or hesitation before committing. Pairing the two turns an abstract chart into something you can actually change on the water next time out.

What if my club already uses one of these tools? Consistency with your fleet matters for anything built around comparing tracks against each other, like RaceQs replays or a club series. There's nothing stopping you from also using a personal tool like SailingMetrics for your own training and tacking practice alongside whatever your club uses for race day, since the two are solving slightly different problems.

Is any of this worth it if I only race casually? Probably more than you'd think. You don't need to be chasing a national title for a tack detection chart or a leg time breakdown to be useful. Most sailors are surprised by how much of their perceived boat speed problems turn out to be manoeuvre losses rather than straight line speed, and that's exactly the kind of thing you can't see without some form of tracking.

The bottom line

Sailing analytics has come a long way from a GPS watch and a spreadsheet, and the honest truth is that most of the platforms above are good at the specific thing they were built for. The mistake most sailors make isn't picking a bad tool, it's picking a tool built for a different kind of sailing than the kind they actually do.

If you're racing dinghies or small keelboats at club level and want a tool that covers recording, analysis, training, and a reason to keep coming back to it every week, that's precisely the gap SailingMetrics was built to fill. Synced video and telemetry, real tack and speed analysis, a training mode for solo practice, and a competitive structure that gives your data somewhere to go, all in one place, without needing separate hardware or a professional budget.

Create a free SailingMetrics account and upload your next session. You'll have a full performance breakdown within minutes of stepping off the water.