When the GPS does not work,
- In view of dry land: we use the nautical chart and daymarks or noteworthy objects that you can pick up from dry land and we position ourselves in this way via triangulation.
- Offshore and with dry land out of site: we use a sextant which is able to measure the altitude of the stars, the nautical chart, the nautical almanac and a watch. And then we can position ourselves!
Question submitted by William, La Créche, France