Notes from questions I looked into.
When a question sticks with me, I look for reliable material and write down what I can confirm.
The annual pass covers federal entrance and standard day-use fees, but not every expense at a recreation site. I compared the current prices and coverage before deciding when the math makes sense.
A USGS elevation result is an interpolated estimate from underlying 3DEP data—not a surveyed elevation for that exact point.
National Park Passport cancellations are free ink stamps, but their exact locations can change. I reviewed the official directories and organized a practical way to look them up.
A practical checklist for reading an ISS sighting forecast, including local time, visibility duration, maximum height, and where to look.