At around 26 mins Jemma finds a sextant in its protective wooden case buried in the sand and places the instrument in her satchel, risking damaging it.
Although it's not made clear whether the instrument was actually necessary to take measurements, or if it was only a source of inspiration for a course of action. If the latter, and Jemma never intended using it, then there's no goof.
Although it's not made clear whether the instrument was actually necessary to take measurements, or if it was only a source of inspiration for a course of action. If the latter, and Jemma never intended using it, then there's no goof.
They made the usual mistake in science fiction films of assuming the whole planet was like where they landed. If aliens landed in the middle of Atacama Desert it would be foolish for them to assume there was no life on Earth.