This app shows the cources of migratory birds to Guam in 3D.

FEATURES
- Candidates as starting point are 3 north places. All of them are shown at the same time.
- As locations of observer, by GPS, by network, and some preset places.
- Easy to grasp altitude of each course, by perpendicular lines to the surface of the earth.
- The viewpoint links the direction of your device by accelerometer and magnetic field sensor.

NOTES
- The altitude of each course is inaccuracy. It depends the kind of bird.
- The scale is inaccuracy.
- Birds will have no rest on the way.
- Do not gaze at the luminous points such as the sun to protect your eyes.