 Some may also be fitted with a low-power radio receiver allowing a remote signal to trigger the automatic release.Locational data provided by GPS devices can be displayed using GIS packages such as the open-source GRASS or plotted and prepared for display on the World Wide Web using packages such as Generic Mapping Tools (GMT), FollowDem (developed by Ecrins national Park to track ibex) or Maptool.Statistical software such as R can be used to display and examine data and may reveal behavioural patterns or trends.