Understanding Data Supply Modes in Dash Cam GPS and MDVR Systems

When choosing a Dash Cam GPS or MDVR (Mobile Digital Video Recorder), one of the most important aspects to consider is how the data is supplied and transmitted. Different supply modes offer different benefits, requirements, and limitations. Below is a breakdown to help you understand the options and choose the right one for your business.

1. Local Storage (TF Card / Hard Disk)

How it works:

Video and GPS data are stored directly on the memory card or hard disk inside the device.

Customer needs to provide:  

Memory card / hard disk with sufficient capacity.

A way to manually retrieve the data (remove card or connect via USB).

Pros:

Simple and low cost.

No SIM card or internet connection required.

Cons:

Data can only be accessed locally.

If the device is stolen or damaged, data may be lost.

2. WiFi Upload

How it works:

When the device connects to a WiFi hotspot (e.g., at depot or parking area), video and GPS data are automatically uploaded to the server.

Customer needs to provide:

WiFi network with stable coverage and bandwidth.

Server or cloud storage to receive data.

Pros:

No SIM card costs.

Suitable for fleet vehicles returning to base regularly.

Cons:

Not real-time (data uploads only when WiFi is available).

Limited by WiFi coverage.

3. 4G Cellular Upload

How it works:

Device uses a 4G SIM card to transmit video and GPS data to the server in real time.

Customer needs to provide:

4G SIM card with data plan.

Server or platform for receiving and storing data.

Pros:

Real-time monitoring and playback anywhere.

Supports remote management.

Cons:

Ongoing cost for SIM card data plan.

Requires stable 4G coverage.

4. Hybrid Mode (4G + Local Storage)

How it works:

Data is transmitted in real-time via 4G, but also stored locally (TF card / hard disk).

Customer needs to provide:

4G SIM card with data plan.

Memory card / hard disk.

Pros:

Real-time monitoring with backup in case of poor signal.

Blind zone re-upload supported (offline data uploaded once network is restored).

Cons:

Higher cost due to both storage and SIM card.

Key Differences at a Glance

Supply Mode	Real-time?	Needs SIM?	Needs WiFi?	Needs Local Storage?	Cost Level	Typical Use Case
Local Storage	❌ No	❌ No	❌ No	✅ Yes	★ Low	Small fleets, individual use
WiFi Upload	❌ No	❌ No	✅ Yes	✅ Yes (optional)	★ Low-Mid	Depot-based fleets
4G Upload	✅ Yes	✅ Yes	❌ No	❌ Optional	★★ Mid-High	Long-distance fleets, logistics
Hybrid (4G+Local)	✅ Yes	✅ Yes	❌ No	✅ Yes	★★★ High	High-value fleets, safety compliance

✅ Conclusion:

If you need real-time video and tracking, go with 4G or Hybrid mode.

If cost is a concern and vehicles return to base daily, WiFi upload is practical.

For extra safety and backup, choose Hybrid mode with both 4G and local storage.