Honda vehicles with Garmin Navigation usually come with either 3 (2021 Honda North America vehicles and newer) or 5 years (all other model years and regions) of map updates at no cost.  These map updates are available roughly once per calendar year.  If you are unsure, we advise you to ask your local dealer about your subscription.
If you need it, you can update the maps by following the steps described on the following link: https://support.garmin.com/en-GB/?faq=4qpP6QRT6r105RJ1sELgM7 
Alternatively, feel also free to contact your local authorised Honda dealer, who also would be able to assist you further regarding the map updates. Please be aware that it might not be free of charge then, however, it depends on the individual dealership's policy. You can find the contact details of your nearest dealership here: https://www.honda.co.uk/cars/dealer-search.html