In the search box ( magnifier) enter "Brooklyn,Kings" then zoom out a little to see the map and circle
http://audubon.maps.arcgis.com/apps/Viewer/index.html?appid=87992bb4fea643f6b044488f48528eae
( Note except for the Prospect Park Boathouse walk at noon, the Kings CBC is now closed )
see http://www.brooklynbirdclub.org/trips.htm