Two Ways to Navigate Your Car
If your car has a factory navigation system, you have two realistic options when the maps go out of date: update the navigation SD card, or buy a separate portable sat nav. Both will get you from A to B — but they work very differently and suit different drivers. Here’s an honest comparison for UK drivers in 2026.
Factory Navigation SD Card: The Case For
- Integrated experience — route guidance through your car’s own speakers, displayed on the factory screen at the correct viewing angle, without wires or suction cups
- No extra hardware — nothing to mount, charge, update separately or lose between journeys
- Works offline always — no mobile signal needed, ever
- Speed camera integration — most update cards include current fixed speed camera locations for the UK
- No battery drain — your phone stays charged
- Resale value — a car with an updated factory nav system is more attractive to buyers
Factory Navigation SD Card: The Limitations
- No live traffic — most SD-based systems don’t show real-time congestion
- Annual update cost — a new map card every 1–2 years
- Can’t use in another car — tied to your specific navigation system
Portable Sat Nav: The Case For
- Live traffic — Garmin and TomTom portables offer real-time traffic via a smartphone connection or built-in SIM
- Move between vehicles — take it from your car to a hire car, van or partner’s vehicle
- Speed camera updates — subscription-based live camera alerts
- One-off cost — many include lifetime maps and traffic for a single purchase price
Portable Sat Nav: The Limitations
- Mounting required — windscreen suction mounts can obstruct vision and leave marks
- Needs charging — another device to keep charged
- Screen quality varies — budget portables have poor screens in sunlight
- Audio integration — most portables use their own speaker rather than the car’s audio system
- Additional clutter — another device in the car
Our Recommendation
For drivers whose car already has factory navigation, updating the SD card is the better choice in most cases. The integrated experience is superior, there’s no additional hardware, and the cost over 2–3 years is comparable to a mid-range portable device.
A portable sat nav makes more sense if: you frequently move between vehicles, you need live traffic data as a priority, or your factory navigation system is too old to get an update card for. For most UK drivers with a working factory nav system, keeping it current with a fresh SD card is the more convenient and better-integrated solution.