On the connecting land in the north is written, on the Nancy map: "Unipedes maritimi," "Pigmei maritimi," "Griffonii regio vastissima," and "Wildhlappelandi." As these names are not mentioned in Clavus's text, it is uncertain whether the fabulous creatures may not be to some extent additions for which he is not responsible.
After the map was drawn, with its bays and headlands, and the coast of Scandinavia provided with a suitable number of islands, Claudius Clavus set himself to describe it; where he had no names from earlier sources, he numbered the headlands, bays and islands, "Primum," "Secundum," etc.
A remarkable thing about the Nancy map is that it has two divisions of latitude: one according to Ptolemy on the left-hand side of the map, and another according to Clavus himself, on a scale four degrees lower, on the right-hand side. According to the latter, Roskilde would have a longest day of seventeen hours (through a transposition the Nancy map gives seventeen hours thirty minutes), which, as pointed out by Björnbo [1910, p. 96], exactly agrees with what Clavus may have learnt from a Roskilde calendar ("Liber daticus Roskildensis") of 1274. Björnbo has also remarked that Bergen is given a remarkably correct latitude, 60° (the correct one is 60° 24'), and thinks it possible that there may have been a Bergen calendar which Clavus has used. But a more likely source, unnoticed by Björnbo, is to be found, as mentioned on p. 260, in the "Rymbegla" tract, where the latitude of Bergen is given as 60°. It is true that the same tract gives the latitude of Trondhjem (Nidaros) as 64°, which does not agree with the Nancy map, where there is a difference of only 2° between Bergis and Nidrosia. Even though it is probable that Clavus was acquainted with some such tract, with which his statement as to land at the North Pole also agrees, it may have been a somewhat different version from that which found its way into the "Rymbegla," and perhaps the latitude of Trondhjem was not mentioned there. On the other hand, he may have found, there or elsewhere, the latitude of Stavanger given, 1-1/2° farther south than Bergen (?).
If we assume that Clavus, even in the construction of his first map, made use of the Medicean map of the world, and that his Greenland is the most westerly peninsula of the latter's Norway, it will seem strange that he did not also draw the west coast of that peninsula, which would naturally become the west coast of Greenland. It is true that the Nancy map is only a copy, but as the west coast of Greenland is not mentioned in the copy of Clavus's text either, we are bound to believe that he did not include it. The margin on the western side of Clavus's first map was evidently determined by that of Ptolemy's map of the British Isles, and follows precisely the same meridian. Thus there was no room for the Medici map's peninsula corresponding to Clavus's Greenland. As already stated, it is difficult to get away from the belief that the Medici map was used for the east coast of Greenland, the south coast of Norway, etc.; the resemblances are too great, and otherwise inexplicable (cf. p. 261, note 3).