This is the simplest tutorial on how to add or update maps to your Garmin Sat Nav. Garmin maps are simple .img files (files with .img extension). So updating or adding maps is as simple as copying and pasting a file, which has to be named gmapprom.img or gmapsupp.img.In some places, you may find locked files, but there are tools to unlock those. With prices starting at £39.99 for rising all the way up to £399.99 for a top of the range Sat Nav it can be a really hard decision to choose the best sat nav from all the available unit across the market. One of the most popular Sat Nav brands, TomTom Sat Navs are designed to help you navigate unfamiliar roads with ease. They’re great for drivers looking for clear and easy to navigate menus, a wide range of map options and useful features, as well as value for money. Every TomTom Sat Nav features a. Imagine a professional sat nav for truck, coach or van with tailored routing, dedicated POIs, Lifetime Map updates over Wi-Fi® and TomTom Traffic. Discover now. Explore our guides to using and updating your satellite navigation system. Keep your satellite navigation system up to date with the latest map updates. To update your TomTom navigation device, you need to install the MyDrive Connect application on your PC or Mac computer. MyDrive Connect is our free support application that helps you to manage your content and services on your TomTom navigation device. Wherever you are in the world, sat navs can get you from A-to-B quickly and efficiently. Whether you’re driving at home or abroad, for work or for pleasure, there’s a sat nav deal to take the stress out of driving. Compact, lightweight and portable, these devices can easily be moved from one car. My SAT NAV is a couple of years out of date now and I'm looking into ways to update this. Audi charge a small fortune for the latest update, so forget that. Apologies if this has been mentioned before, but don't bank on using your car on the day you update your Sat Nav SD card. With a new-ish laptop and 40MB broadband, it still took 6 Hours! Frequently Asked Questions. General; I know nothing about sat-nav - how can I find out about it? How good is digital mapping for Ireland? What systems do you recommend?