Dash Cam Features Explained: A Plain-English Guide

Dash cam listings are full of jargon, and it is hard to know which features matter and which are marketing. This guide explains the most common terms in plain language so you can read a spec sheet with confidence and decide what you actually need. You can compare specific models and current prices over in our dash cams section.

What is loop recording?

Loop recording is how a dash cam records continuously without ever filling up the memory card. The camera saves footage in short segments, often one, three, or five minutes each. When the card is full, the camera automatically writes over the oldest segment that is not protected. This means the camera can run every drive indefinitely, keeping the most recent footage. A few practical points:

• Older clips are overwritten, so download anything important soon after an incident.
• Protected or locked clips are skipped during overwriting, so they are not erased.
• Shorter segment lengths make individual files easier to find and share.

What is a G-sensor?

A G-sensor is an accelerometer that detects sudden changes in motion, such as a hard brake, a bump, or a collision. When it senses an impact above a set threshold, the camera automatically locks the current clip so loop recording cannot overwrite it. That way the footage from a crash is preserved as evidence even if you forget to save it manually. Most cameras let you adjust the sensitivity, which is useful if rough roads trigger it too often or if it is not catching real events.

What is parking mode?

Parking mode keeps the camera watching while the car is off, which is how you capture hit-and-runs, door dings, and theft attempts in a parking lot. There are two common styles:

1. Motion or impact detection, where the camera wakes and records only when it senses movement or a bump, saving power and storage.
2. Continuous parking recording, which films the whole time at a lower frame rate.

Parking mode usually needs a constant power source, most often a hardwire kit connected to your fuse box. A good hardwire kit includes low-voltage protection so the camera will not drain your battery flat.

Do I need GPS and WiFi?

These two features are convenient but optional. GPS records your location and speed alongside the video, which can help establish where and how fast you were driving if there is a dispute. WiFi lets the camera connect to your phone so you can review, download, and share clips through an app instead of pulling out the memory card. Neither feature improves image quality, so decide based on whether location data and phone access matter to you.

What SD card size do I need?

Because dash cams record in a loop, the card size determines how many hours of footage you keep before it overwrites. Higher resolution and a second rear camera use space faster, so they benefit from larger cards. Two things matter more than raw size:

• Use a high-endurance microSD card designed for constant writing, since standard cards wear out quickly under continuous recording.
• Check the maximum card capacity your camera supports, as exceeding it can cause errors.

It is also worth reformatting the card periodically through the camera's menu to keep recording reliable.

Once you know which features fit your driving, you can compare models, prices, and verified buyer reviews on Amazon. Ready to look? Browse our guide to dash cams.