Navigate with a map app, look at the full map around the OLC, do a reverse lookup to get possible reference points to get people to the right region first. You can also enter place names or short codes with location references (like "9G8F+6W London" or just "Central Park") which will be geocoded using OpenStreetMap.
Want more info? Get the full story about Plus-codes. There is also a more precise version for e.g. slum navigation.