What Is a GPS Speed Overlay on a Dashcam?
A GPS speed overlay is real-time speed and timestamp data recorded directly onto your dashcam footage, creating a visual record of how fast you were driving at any moment. Hawk by MRVL adds this overlay to every clip you record, giving you court-ready evidence with pinpoint accuracy.
How a GPS Speed Overlay Works
A GPS speed overlay uses your phone's built-in GPS sensor to track your vehicle's speed in real-time. As you drive, Hawk records this data alongside your video, embedding the speed and timestamp directly into each frame. This creates a permanent record that shows exactly how fast you were travelling at any point during the journey. Unlike standalone dashcams that require external hardware, Hawk uses your iPhone or Android's existing GPS chipset, so there's nothing extra to buy or mount. The overlay is written to the video file itself, making it tamper-proof and admissible as evidence in insurance claims or small-claims court.
Why Speed Data Matters for Driving Evidence
Insurance companies and courts care about speed because it's often central to fault determination. If you're in a collision, a GPS speed overlay proves whether you were within the speed limit at the moment of impact. It eliminates guesswork and he-said-she-said arguments. Rideshare drivers and commuters benefit most; the overlay creates an objective record that protects you if a passenger claims you were speeding or if another driver contests the circumstances of an incident. Hawk's speed overlay is gated by your GDPR profile settings, so you control when it's recorded and stored.
GPS Speed Overlay in Hawk
Hawk records a GPS speed and timestamp overlay on every video clip you capture, whether you're commuting daily or driving for a rideshare platform. The overlay displays your speed in real-time, synced with the video timeline. When you export a clip for a dispute, Hawk bundles the video with an SHA-256 integrity manifest, proving the footage hasn't been altered. You can replay your trip using the built-in map replay feature, which traces your route as a MapKit polyline, giving context to the speed data. This combination of video evidence, speed overlay, and map replay makes your claim nearly impossible to challenge. Free users get 10 clips per month with a 7-day retention window; Local Pro and Rideshare Pro tiers offer unlimited recording and iCloud sync for long-term evidence storage.
Speed Overlay vs. Connected Dashcams
Traditional dashcams either come built into a car or require a dedicated hardware device mounted on your dashboard. A GPS speed overlay on those devices is often optional or requires a separate GPS module. Hawk is different; it turns your existing smartphone into a court-ready dashcam with speed overlay included. You don't need to buy hardware, subscribe to cloud storage upfront, or carry a second device. Your phone is your dashcam. The speed data is stored locally on your phone by default, and only syncs to your own iCloud if you upgrade to Pro. This approach is especially useful for new drivers, rideshare workers, or anyone who wants evidence without the expense and clutter of dedicated hardware.
How to Use Hawk's Speed Overlay for Evidence
Start recording before you begin your journey; Hawk runs continuously in the background, capturing video and GPS speed data automatically. If an incident happens, the speed overlay proves your velocity at that exact moment. Tap the evidence locker to save the clip, which is then protected with a biometric lock and integrity hash. When you need to file a claim, tap dispute export; Hawk packages the video, speed overlay, timestamp, and SHA-256 manifest into a ZIP file ready to send to your insurer or submit to police. As of June 2026, this one-tap process has made dispute resolution faster for thousands of commuters and rideshare drivers across the UK.
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Frequently asked questions
Is GPS speed overlay admissible in court?
Yes. Because Hawk embeds the speed data directly into the video file and seals it with an SHA-256 integrity hash, the overlay is treated as evidence-grade by insurers and small-claims courts. The manifest proves the file hasn't been tampered with.
Does Hawk's speed overlay drain battery?
GPS is on constantly anyway for location services on most phones. Hawk uses the existing GPS chipset without heavy extra load. Battery drain is comparable to navigation apps like Google Maps.
Can I turn off the speed overlay if I want privacy?
Yes. Hawk respects GDPR; you control the overlay setting in your profile. You can record without speed data if you prefer, though we recommend keeping it on for evidence.
What speed units does Hawk display?
Hawk displays speed in miles per hour (mph) for UK users. The overlay syncs with your phone's locale settings.
Do I need cellular or data for the speed overlay to work?
No. GPS works offline. Hawk records speed and location data even if you have no signal. Data only syncs to iCloud (Pro tier) when you're connected again.