When the rollover happens older devices may reset their date, potentially corrupting navigation data and throwing off location estimates.
GPS relies on precise timing data to operate, and each nanosecond the clock is out translates into a foot of location error.
If your GPS has LMT in the description is because Life Time updates are included already (no extra charge).
Once you got this, you install Garmin software from their website and you get the updates whenever you want.
They are free, created and updated by users and volunteers across the World. Copy the unzipped file (gmapsupp.img) to your SD card [Only for advanced users]: browse OSM website or other providers to find more specific maps. Once connected to your computer, it will appear as an additional drive, as shown in the image below.