If I would have to spend money, I would buy an update once year or year and a half.
You connect your sat-nav to your PC or Mac using the USB cable that came in the box.
If you have lost your USB cable you can get a replacement. Within Garmin Express, selecting 'Install All' under the 'Updates' tab is the safest option.
Even with several years of updating various models of Garmin sat-navs, I have found the experience torturous at times.
You buy a micro/SD card preloaded with the Ireland/UK maps, you insert it into the side of your device and off you go.
Ford policy is one of continuous product development.