""what belongs to cosmography and seamanship I hope to spell out (…) ...how does a headland or place lay in respect of another; and this so that this work takes order and grounding; and the coast may be more safely navigated; and likewise the knowledge of the lands and where lay the shallows which for this it is much necessary to know; also of the sounders performed in some places what their depth is and also the different of the bottoms, if they are mudd or sand, or stone, or pebbles, or sharp edges, or shells (burgao = Livona pica) or what quality is such sounding; and being known what is the distance from the shallows to the coastline; and likewise the tides, if they are from northeast and southwest like those from our spain, or is they are from north and south, or west and east, or northwest and southeast, which for the purpose of entering and exiting ports and river-mouths are absolutely necessary; and also de measurements from the poles from which can be known how many degrees are the places apart and the latitude relative to the equator; and also the nature of the people of this ethiopia (Africa) and their mode of life and I will also talk about the commerce that could be had in this land"