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Survey is a Military Policy Card in Civilization VI.
Strategy[]
Survey is one of the earliest available policies in the game, and one of the two starting Military policy choices (unless you play as Germany, which has an extra Military slot and will be able to use both Survey and Discipline). It is very helpful for the initial 20 or so turns, especially if you have more than one Scout. They will race through levels as they discover natural wonders and activate Tribal Villages, or enter the occasional clash with Barbarians. If you're lucky, you could get two or even three 
Promotions for a Scout, which will last them throughout the game!
Note that after 
Turn 20 the other choice for Military Policy becomes better, since Barbarians will turn into a real nuisance at this point.
If you are playing as the Inca, this policy card can be paired nicely with the Warak'aq, which can attack twice. This allows the Warak'aq to gain levels four times as fast as a Skirmisher without this card.
Civilopedia entry[]
Even prehistoric tribes had “scouts,” those hardy individuals who went out looking for better caves, hunting grounds, and sources of water. Once folk settled down and began clumping together in villages and towns, fleet-footed and eagle-eyed individuals willing to hike over the hills and trudge through trackless forests remained of vital importance, for a civilization that doesn’t know what’s going on around it is blind to both opportunities and dangers. As they surveyed the surroundings and brought back tales of fabulous wonders, scouts not only expanded possibilities, but humanity’s imagination as well.
