make you partaker of another simple discourse of navigation, wherein
I have not a little travelled, to make myself as sufficient to bring
these things to effect as I have been ready to offer myself therein.

And therein I have devised to amend the errors of usual sea-cards,
whose common fault is to make the degrees of longitude in every
latitude of one like bigness.

And have also devised therein a spherical instrument, with a compass
of variation for the perfect knowing of the longitude.

And a precise order to prick the sea-card, together with certain
infallible rules for the shortening of any discovery, to know at the
first entering of any strait whether it lies open to the ocean more
ways than one, how far soever the sea stretcheth itself into the
land.

Desiring you hereafter never to mislike with me for the taking in
hand of any laudable and honest enterprise, for if, through pleasure
and idleness, we purchase shame, the pleasure vanisheth, but the
shame remaineth for ever.

And therefore, to give me leave without offence always to live and
die in this mind, THAT HE IS NOT WORTHY TO LIVE AT ALL THAT FOR FEAR
OR DANGER OF DEATH SHUNNETH HIS COUNTRY'S SERVICE AND HIS OWN
HONOUR, seeing death is inevitable, and the fame of virtue immortal.
Wherefore, in this behalf, Mutare vel timere sperno.