Dash's base map matches the Republique Arabe D'Egypt, Ministere de l'Habitat et de la Reconstruction, Survey of Egypt, 1978 topographic maps. The Survey of Egypt maps are very good. Dash's base map also corresponds well to two satellite images. So, Dash's base map appears to be accurate.
Dash's survey points do not match the Survey of Egypt maps nor the two satellite images.
In my opinion Dash's survey points should be considered inaccurate until the discrepancies with other sources are explained.
Images of comparisons (Dash maps shaded red):
C. Wayne Taylor
Richmond, Virginia USA