Cache is at posted coordinates! Night fishing is a great way to catch certain species of fish, like walleye or fish in the catfish family. It is also a great time to find special caches, called night caches. You usually need to have some sort of light and follow reflectors to the hidden cache container there are other types, but that is the most common.
Your challenge if you choose to accept it is to find 50 "recommended at night" and 15 "Night Cache" attribute caches.