Very helpful for field ID, with detailed species markings that can be turned on or off, along with several excellent, varied photos for each species, a page of well-organized descriptive detail about birds appearance and habitat. Multiple song and call recordings for each species is an astounding asset for ID, and periodically draws responses from nearby birds. iBird Ultimate provides lots of room for field notes, couple clicks enters time/date and GPS of sightings. Theres also an informative conservation status screen for each species. For better or worse, this app is a game-changer in the field as long as you have battery power. Appreciate how its developers appear focused on improving what is already a very good birding guide.