Bear in mind that updates can be expensive – costing almost as much as you paid for the satnav in the first place - and it might be worth putting the money towards a new, better-featured satnav which will come with the latest maps.(Plus, new satnavs almost universally have a 90-day ‘latest map guarantee’ which means that if a new version is released within three months of purchasing, you are entitled to download it and update your device for free.) There are two main ways to update maps on a satnav.The easiest is to use the USB cable that came with it to plug it into your PC.

Regardless of which method, you’ll also need to install the software that came on a CD, but it’s better to check the manufacturer’s website for the latest software.

Don't forget that your satnav's software (as opposed to the maps) may also need updating, so look for 'firmware' or software updates for your particular model on the manufacturer's website support section.

Here are the links to the relevant pages to download the appropriate software for your satnav: Tom Tom’s charges depend on how old your map is, with 40 percent off if your map is 3-6 months old.

See also: Satnav reviews Of course, it’s up to you how regularly you update your satnav’s maps and different manufacturers offer different options, ranging from subscriptions for regular updates to one-time upgrades.

You might want to buy additional maps – for example upgrading from UK & Ireland to full Western Europe – so you can use your satnav on holiday.

As long as your satnav is relatively modern (within the last five years or so), you should be able to update it.

Smaller brands such as Navigon might present a problem, but those with Tom Tom, Garmin or Navman satnavs should be fine.

Depending on which figures you believe, up to 15 percent of the UK’s roads change each year.

That means your satnav’s maps will become less accurate as time goes on.