You must turn on the browser location services to get the route from your current location to the sign, and the distance (as the crow flies) from your current location to the sign.
After activating location services, refresh the page.
On the sign:
MARITIME GREENWICH MILLENNIUM HERITAGE TRAIL WORLD HERITAGE PATRIMONIO MUNDIAL PATRIMOINE MONDIAL [World Heritage Site symbol]
A point on the Greenwich route marking the National Maritime Museum, a World Heritage Site. The museum is part of the Maritime Greenwich site, which also includes the park, the observatory and more. The site was declared a world heritage site in 1997.