DESTINATION
An official trail destination or independent guide-addition reference. It does not by itself promise after-dark access.
MAP KEY / NIGHT ROAD / FIELD GUIDE
Read the map before you read the road.
These maps are designed for trip decisions across both the official trail and the guide additions, including clearly separated daytime space stops. A destination pin tells you where a place is. A status tells you what we actually know about access. Precision labels tell you how exact the geometry is.
01 / FEATURE TYPE
What the symbol means
OBSERVING
A source-named or verified area useful for stargazing.
PARKING
A parking area with a source-supported relationship to the night site.
CAMPING
A campground or designated overnight base.
PROGRAM
An observatory, star party or guided-night location.
TRAILHEAD
A trailhead or backcountry access point.
ROAD
A road whose condition or vehicle requirement matters to the night plan.
RESOURCE
Visitor center, dark-sky kit pickup, museum, planetarium, dark-sky center or other planning resource.
02 / ACCESS STATUS
What the color means
Current manager guidance supports nighttime presence/viewing.
A campground, lodging property or other legitimate overnight option; reservations/rules may still apply.
Night access is tied to a scheduled program, booking, gate or specific restriction.
The place has posted day-use closing hours. Do not infer all-night access from a Dark Sky designation or rural setting.
Road, campground or facility is not reliably available year-round.
High clearance, 4WD, weather or road-surface conditions are material.
Useful place, but current parking/hour/legal details need checking before a late visit.
Orientation or planning resource only. Not a claim about exact parking or legal after-dark access.
03 / COORDINATE CONFIDENCE
How exact is that pin?
The managing source publishes a coordinate used directly on the guide map.
The source publishes an address, but unless a source coordinate is separately documented the marker remains a broad facility/area reference rather than an exact parking pin.
The manager names the place, but this guide does not invent an exact parking coordinate.
A broad community, park, pass or property reference point used for orientation only.
04 / BROAD MAPS
State, region and route geometry
Colored region wash: a curated guide travel zone drawn to match the intended geographic extent of each guide region. The washes can overlap on purpose, but they are not county, tourism-district, land-management or legal boundaries.
Dashed route line: the editorial stop sequence for one of the guide's curated routes. It connects the mapped stop centers to show the route corridor. It is not turn-by-turn navigation and should not be read as the exact road centerline.
City dots: orientation references for major gateways and regional hubs. Municipal shape and place labels underneath come from the map-data base layers.
05 / BASE MAP + ROADS
What is underneath the symbols
Guide maps use the U.S. Geological Survey’s USGS Topo service for terrain and topographic context. USGS describes that basemap as combining current National Map themes including boundaries, geographic names, transportation, elevation, hydrography and land cover. Statewide, region and route views add U.S. Census Bureau TIGERweb transportation geometry so major roads remain readable through the guide’s dark treatment.[1][2]
Important: a road drawn on either basemap is map context, not proof that the road is legally open, snow-free, passable, public or suitable for a passenger car. The individual place file and current land-manager or road source remain the access authority.[1][2]
06 / SPECIAL CASES
Not every map pin is an observing pin
Blue daytime-space pin: museums, planetariums and indoor space-science stops are deliberately separated from orange guide-addition pins. They are useful trip stops, not claims about dark-sky access or permission to use their parking lots after hours.
Some guide additions are observatories, booked lodging, dark-sky kit pickup points or future projects. Their map cards say so explicitly. A library or visitor-center pin tells you where to get a resource; a planned observatory marker tells you what is coming; neither is an invitation to remain in the parking lot after hours.
07 / NIGHT-SKY DATA
Dark is not one number
Satellite nighttime-light products such as NASA Black Marble measure nighttime radiance reaching an orbital sensor; they are not Bortle observations. The Bortle scale is an observational estimate based on what an observer can see in the sky. This guide may use satellite and light-pollution-map context for a provisional Bortle estimate, but it labels that estimate as approximate until better field or source evidence is available.[3][4]
KEEP GOING / PRACTICAL GUIDE
Now decode the rest of a stop
The Practical Guide explains the Bortle, access, camping, road, facilities, signal, telescope and program labels that appear across stop pages.