Name that shore
Florida is flat, so everything on the horizon looks like a bump. Hold your phone up from the boat or the beach and it names what you're looking at: lighthouses, the Skyway, water towers, keys and islands, launch pads, drawbridges, inlets and passes, and how far off each one is. Tap a name and it reads it out.
Your location and camera stay on your phone. No location? Pick a spot:
All the way around
How far you can see depends on how high your eyes are and how tall the thing is: a 100-foot lighthouse from a boat is gone past about 14 miles; the Skyway's 430-foot towers show up from 25. Haze cuts that a lot. Landmarks from OpenStreetMap contributors (ODbL) and our own drawbridge and sandbar lists; inlet mouths from the USGS place-name list (GNIS). Phone compasses drift near metal and motors, so use the nudge slider. Not for navigation: use your chart.