Not a links page. These are the sources we point to for charts, weather, locks, safety, and route knowledge — each marked by who stands behind it and, just as important, how to use it well. Official authorities lead; community and commercial tools are listed for what they're good at, never ranked or endorsed.
This desk is a starting point, not a substitute for the source. We've grouped and labeled these resources — and added a few words on how to use each shelf well — so you can tell authority from opinion at a glance. But conditions change, models differ, and a forum post is not a chart.
When a decision touches safety, go to the official source and read it yourself. That's the whole purpose of a reference desk.