Ship „MS GEHEIMRAT MAU“

[offshore]

„MS GEHEIMRAT MAU“( Regierungsdampfer ?"Geheimrat Mau"built  F. Schichau, Elbing, Danzig, 1908 as special ship, hafenbau Inspection? )  was the ship  of  Wasserstrassenamtes Stolpmünde, later on replaced by another ship, MS Anderson.
I'm looking for information when the replacement took place and what type of ship it was and the  technical parameters of MS Geheimrat Mau.