You can even use a flat Earth model for navigation over long distances -- you just might not get the most optimal route, and your map projection (if you&#x27;re using a map!) will distort <i>something</i>. But it might not be something that you&#x27;re very concerned about for your particular navigation purposes.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Theorema_Egregium" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Theorema_Egregium</a>