if your lost in Ireland,north or south ,then I still reckon the only one to have is the jonjoe youtube.com/watch?v=yoNNi6NuKbU
I do have a sat nav , although it remains in my kit bag most of the time as I prefer to use my truck map, & do my route planning. Always take a good truck road map with me .
a sat nav can be useful locating ’ new builds ’ post codes though.