As to the Northeast Passage, Nordenskiöld's trip to the Yenisei river in 1875 hinted at this being the easier route. The successful completion of the passage during Nordenskiöld's expedition with the steamship Vega was published in 1879 in PGM shortly after Petermann's death. The map was drafted on top of Petermann's 1873 map of Siberia. The route of the Vega had also appeared on a Russian copy of Petermann's 1873 map. The PGM editors also added it in their 1879 map. This might have been a way to honour Petermann. The map shows clearly to what degree the descriptive data of older explorations (i.e. Vasili Pronchishchev, 1735–36; Hariton Laptev, 1739–43; Semyon Čeluskin, 1735–43; Fyodor Minin and Dmitriy Sterlegov, 1740; and Alexander Theodor von Middendorff, 1843) could be trusted when drafting a map from many sources and trying to amalgamate them into a single image. The difference between the coastlines on the two maps sometimes can be as much as ½° latitude and 1° longitude. Looking at the Taimyr peninsula, the channel between it and the mainland is reduced from approximately 10 km to a few kilometres by the Swedish exploration. The only exception was the information derived from P.F. Anjou (1823), which was based on astronomical observations, and is the same in both maps. The article (translations from Swedish and Danish with a preamble by Behm) and map appeared four months after the Vega had arrived in Irkutsk. Hassenstein drafted the new map, maybe using the older draft. The title was hammered out of the old copperplate and replaced by a new one, while Nordenskiöld's data were engraved, and printed in red, making it look like an overlay on the old map. Because of the use of lighter background colors the newer map looks much fresher than the older one, though only six years lay between the two. Australia Petermann kept his promise, made in the preface of the first issue of PGM, when he was responsible for the new edition of Stieler's Hand-Atlas. He also had a weakness for Australia. Up to his death he published some 48 maps concerning exploration in (parts of) Australia, though hardly any of the expeditions bore any German influence. In 1866, when he gave an account of the first issue of the fifth edition (1866–67) of the Stieler, he frequently referred to maps or articles published in PGM. Furthermore, he mentions that he