Berkley Plantation is not listed which I suspect is what is shown as the area depicted as "Position of Harrison's Landing." This area is bounded to the West by Rowland's M Pond and swings clock wise ending at Westover Landing. The only mention of Berkley is the landing by the name just to the West of Westover and downstream from Harrison's Point.
The Harrison residence is shown just to the West of the M. Pond to the North of Harrison's Pt. on the river.
The West Point Atlas of American Wars, Vol. 1, Vincent J. Esposito, Ed., Plates 136 a. & b., also show "Harrison's Landing" as a land area as noted above. No mention of other landings, plantations, etc.
Perhaps the lack of detail may be explained as these maps were produced by U. S. Army Topographical Engineers.
Thanks for the offer, I might just take you up on that when I come East two years from now for a reunion.
George