Hi. Egpws doesn't use the weather radar beam to provide any sort of mapping function. The map is a terrain database used in conjunction with aircraft location information. I think the statement refers to the display unit only. In an Airbus for example-I would assume a Boeing is the same..- weather radar information is shown on the nd. This can be replaced by the terrain display by pressing the terrain push button. There is also an automatic 'pop-up' function for the terrain display-the terrain display automatically replaces weather radar information on the nd in the event of terrain proximity.