Wyvern nests are really hard to spot in lusher areas, so i think it would be nice to have an item to easier find them. Maybe like an radar which scans the near area and if it finds an nest it will give an signal (and maybe an rough distance or direction). It should not be an item to make things to easy so you could make it so it is really expensive or it has only a short range so you have to use it near a spot where you found wild wyverns.