Ive done my own map symbols since I bought my 5x, mainly to be able to see them on the watch with my 40+ eye's.
From time to time I find a symbol on the watch that I would like to change and often I then start a trial and error thing to find the right symbol id to change in typ file to be able to get the symbol in img file to change. Fun, but time consuming.
Anyone here now of a mapping table between OSM symbol IDs as I see them in a typ editor and Garmin IMG symbols?