Map layers
- Add elevation and hillshade layers
- Add color settings for contour layer
- Add background color setting for paths layer

Field Guide
- Add sightings log for each page

White Noise
- Add sound chooser: noise (white, pink, brown), crickets, waves, fan

Augmented Reality
- Show constellations
- Increase exposure at night

Packing Lists
- Remember last category

Signal Finder
- Show estimated signal distance (experimental)