A G-sensor — short for gravity sensor or accelerometer — is a small chip inside your dash cam that detects sudden changes in motion and impact force. Think of it like the motion-detection system in a phone that knows when you've rotated it from portrait to landscape, but much more sensitive and calibrated for the kind of sudden forces that happen during a car accident. When your RedTiger dash cam detects a sharp jolt, it immediately locks the current video file so it won't get overwritten by loop recording. This is the single most important feature for preserving evidence after a collision, and it's something too many drivers overlook until it's too late.
The G-sensor in RedTiger dash cams — including the F7N Elite, F7NP, ViewClear 70, and F7N Touch — uses a three-axis accelerometer that measures force in the X (left-right), Y (forward-backward), and Z (up-down) directions. This means it can detect not just rear-end collisions but also side impacts from T-bone accidents, sudden hard braking, and even your car being jostled while parked. The raw sensor data is processed by the camera's firmware, which uses algorithms to distinguish between a genuine collision and a false positive like hitting a pothole or closing the car door too hard.
Here's the scenario everyone worries about: you get into an accident, and by the time you remember to save the footage, the camera has already loop-recorded over it. The G-sensor eliminates this risk entirely. When the sensor detects an impact force above a certain threshold, it automatically marks the current and previous video files as protected — meaning the camera's loop recording system will skip those files when it needs space for new recordings.
On RedTiger dash cams, protected files are stored in a separate folder on the SD card called "Event" or "Lock" depending on your model. You can access them through the camera's playback menu or by removing the SD card and browsing the folder structure on your computer. The emergency recording files are usually date-stamped, so even if you have multiple locked videos, you can quickly find the one that corresponds to the time of the accident. I recommend checking your event folder once a month to make sure the G-sensor is actually creating protected files — if the folder is empty after a few weeks of driving, your sensitivity might be set too low.
G-sensor sensitivity is adjustable on all RedTiger models, and finding the right setting for your driving environment makes a big difference. Here's how to change it:
In my experience with the RedTiger F7N Elite, Medium is the best balance for most daily driving. Low works well if you drive a car with a stiff suspension or take a lot of rough roads — the camera won't constantly lock files every time you hit a bump, but it still catches real collisions. High sensitivity is useful for parking mode where you want the camera to detect even minor bumps from shopping carts or door dings, but you'll get a lot of false positives from wind or loud noises if you use it while driving.
The G-sensor plays an absolutely critical role in parking mode. When your RedTiger dash cam is in parking surveillance mode and the engine is off, the camera relies almost entirely on the G-sensor and motion detection to trigger recording. Without a properly configured G-sensor, your parking mode is essentially blind to hit-and-run incidents.
Here's how it works in practice: you park your car at a grocery store, and someone backs into your front bumper. The impact triggers the G-sensor, which wakes the camera from its low-power parking state and starts recording. The camera captures the moment of impact plus the 10-15 seconds after, and locks that file so it's preserved. If you've hardwired your RedTiger 4K dash cam using the HK3 or HK4 hardwire kit, the camera can run in parking mode for up to 48 hours before the voltage cutoff protection kicks in to prevent your car battery from draining.
For parking mode specifically, I recommend setting your G-sensor to High sensitivity. The trade-off is that you'll get more false triggers from passing trucks and thunder, but it's better to have 50 false recordings than miss the one real hit-and-run. Just make sure you have a large enough SD card — at least 128GB — to handle the extra parking mode footage.
| Feature | G-Sensor | Motion Detection |
|---|---|---|
| Trigger | Physical impact or sudden movement | Movement in the camera's field of view |
| Works in Dark? | Yes — doesn't need light | Requires some light or IR illumination |
| False Triggers | Potholes, slammed doors | Tree shadows, passing pedestrians |
| Best Use | Accident recording, parking impact detection | Capturing vandalism, suspicious activity near car |
| RedTiger Setting | G-Sensor menu (Low/Med/High/Off) | Motion Detection menu (On/Off) |
Both features work together on RedTiger dash cams, and they complement each other well. The G-sensor handles physical impacts while motion detection covers visual events. Running both at the same time gives you the most complete coverage, but it does use more SD card space and battery power in parking mode. If you park in a quiet residential area, motion detection alone might be sufficient. If you park on a busy street, you want both active.
Even well-designed G-sensors can behave unpredictably in certain situations. Here are the most common issues RedTiger owners run into and how to solve them:
Want to make sure your RedTiger dash cam's G-sensor is actually working? Here's a simple test you can do without driving anywhere. With the camera powered on and recording, give your windshield a firm tap near the dash cam mount — not hard enough to crack anything, just a solid thump with your palm. The camera should beep or display a notification indicating that it has locked a file. Then go into playback mode and confirm that a new event file was created with a timestamp matching your test. If nothing happens, check your G-sensor setting and make sure it's not set to Off. If it's on High and still doesn't react, you may need to update your camera's firmware or contact RedTiger support. This test takes about 60 seconds and can save you a lot of frustration later.
← Back to Blog