Ask people what a dash cam does and they'll describe the video. But on modern cameras, some of the most valuable work happens in the data wrapped around the footage — where you were, how fast you were moving, and, in the worst case, telling someone you need help when you can't do it yourself. Here's what the location-and-safety feature set actually does, and who genuinely benefits.
GPS: the data layer under the video
A GPS-equipped dash cam continuously logs position and speed alongside the recording. When you play a clip back in the manufacturer's app or viewer, you see the video with a synced map track and speed readout. Three things follow from that:
- Speed disputes end quickly. "You must have been speeding" is the reflex accusation after any collision. A GPS trace showing 28mph in a 30 zone answers it with data rather than assertion.
- Location is provable. The clip isn't "somewhere on a dual carriageway" — it's a specific junction, at a timestamp, on a map. That matters for insurers reconstructing an incident and for police submissions, which ask precisely where the offence happened.
- Journeys reconstruct themselves. For anyone who drives for work, the log answers "which route, when" without a separate tracker.
Why refresh rate matters
Basic GPS units log position once per second (1Hz). At 70mph that's a fix every 31 metres — coarse enough to smear cornering lines and mask short braking events. Higher-end cameras sample at 10Hz, ten fixes per second, which draws a smooth, faithful track even at motorway speeds. The Nextbase 622GW uses a 10Hz receiver for exactly this reason: the speed trace holds up under scrutiny.
what3words: an address for every 3-metre square
Grid references confuse people under stress, and "I'm on the A303 somewhere past the services" is useless to a control room. what3words solves this by dividing the world into 3m × 3m squares, each with a unique three-word name. UK emergency services widely accept these three-word addresses because they remove ambiguity in precisely the situations where minutes matter — rural roads, unlit stretches, anywhere without a visible landmark.
On a dash cam with what3words built in, the camera can display the three-word address of your current position. Break down on a country lane at night, and instead of describing hedgerows to a call handler, you read three words from the screen. It's a small feature that earns its place the first time you need it.
Emergency SOS: when you can't make the call
The most serious scenario a dash cam can address isn't a dispute — it's a crash where the driver is unresponsive. Emergency SOS systems, pioneered on Nextbase's Wi-Fi/Bluetooth-connected cameras, work like this:
- The camera detects a significant impact.
- Via the paired phone app, it begins a countdown and tries to get your response.
- If you don't respond, the system can alert the emergency services with your precise location — down to the what3words square — plus any medical details you've chosen to store in the app (blood type, allergies, existing conditions).
Read that back in the context of a single-vehicle crash on a quiet rural road at night: no witnesses, no one to call 999, a car potentially out of sight of the carriageway. This is the situation Emergency SOS exists for, and it's why the feature deserves more weight in buying decisions than another notch of image quality. Note the practical requirements: the feature needs your phone paired and with signal, and setup done in advance — it's a five-minute job the day you fit the camera, not something to configure after the fact.
Who benefits most
- Solo drivers, especially on rural or late-night routes — the Emergency SOS case writes itself.
- High-mileage and motorway drivers — 10Hz GPS keeps speed evidence credible at speed, and incidents at 70mph are exactly when you want data doing the talking.
- Anyone who tows or drives for work — location logs and provable routes have a way of becoming useful.
- Riders of remote roads — what3words turns "somewhere scenic" into a findable point.
Privacy, briefly
Location data is personal data. For private use that mostly means common sense — the log lives on your card and your phone, and you choose who sees it. If the vehicle is shared or used for work, be transparent about what's logged; the privacy guide covers the details.
The short version
- GPS turns footage into evidence by anchoring it to speed and place; 10Hz sampling keeps it accurate at speed.
- what3words gives you a location you can read aloud to a 999 call handler from any road in the country.
- Emergency SOS covers the scenario nobody plans for — set it up on day one.
The video shows what happened. The data proves where, when and how fast — and in the worst case, it goes for help. That combination is what separates a camera that records your drive from one that actually looks after you on it.