The maps do not represent the actual herd distribution. They only provide a very approximate idea of caribou migration:

• only 40-50 satellite collars are used to track a population of about one million caribou;
   

• a caribou equipped with a satellite collar can travel up to 200 km (125 miles) between satellite signal reception and map publication;
   

• all satellite collars are carried by females;
   

• the detection of a collar provides no information as to the number of caribou in a given sector;
   

• these maps should not be used for your navigation purposes in the North.