de las Marinas gives your Majesty . . . I have informed him so that, being so Christian and zealous a knight in the service of your Majesty, he will give a true and certain relation of all.
With this astrolabe, which, with the aid of God, I have discovered, can be found the altitude from the pole, and the latitude of any region whatsoever at any hour of the day, and at the same time it will tell the hour, in the same way that it gives directions at night by any known star, more easily than the mariners usually take it at midday. Besides this, it also serves like other astrolabes at midday, to indicate the various points of the compass, and show and verify with precision the deviations and deflection of the needle from the pole. In this way it serves to give the longitude where one is sailing, on whatever parallel to the equinoctial. Likewise it shows the position of the stars, even when all their latitudes [i.e., altitudes?] and declinations are unknown, so easily that even the most uninstructed can in a short time learn it. It is of use in other curious, useful, and important ways, for the perfection of this art, which can by its aid be verified. As it is an article so curious and useful, the said Luis Perez de las Marinas persuaded me to give an account of it to your Majesty, with a brief relation and discourse concerning the information which I have of these parts.
Although your Majesty has so little profit from these islands, we can see that it is a place of much importance for the service of your Majesty, and the spread of the most holy Catholic faith, since it has as neighbors, and surrounding it, many extremely rich and fertile countries. The disposition of matters is . . . that they are propitious for your Majesty
