• Filters: In the Filters tab, use Add filter (e.g. Signal type, Line code).
• Legend: Click a category to isolate matching signals.
• Network ID: Filter by a specific ID, then click the pill label to zoom to the signal on the map. While the search box holds at least 4 digits, the map also shows every signal whose ID starts with them, in addition to the pills; clear the box to go back to the pills alone.
• Line code: Filter by code or line label, then click the pill label to fly to the line's extent on the map. Hovering a pill previews its geographic extent on the map as a dashed outline with a dim overlay — the preview clears as soon as the map moves.

• Controls: Right-click a signal for the context menu or use the keyboard shortcuts below.
• Visibility: All signals appear at zoom 10+. Below this, a spatial sample is used to maintain readability (active filters still apply).
• Persistence: Filters, pinned signals, map position, and settings are saved across sessions.

Hovering a signal marker opens a tooltip. Each row shows the signal type (colored label) and its Network ID. When co-located signals differ in direction or placement, they are split into sub-groups separated by a divider. Line code, track code, track name, and kilometric point (KP) are always shared by co-located signals and appear at the bottom.

OSM presence indicators appear once the app has checked the area against OpenStreetMap:

Indicator	Meaning
Dotted underline on Network ID	That specific signal is already mapped in OSM
OSM logo on the first row	At least one signal in this group is already in OSM

The check runs automatically after the map has been still for 30 seconds at a sufficiently zoomed-in view (zoom ≥ 14, fewer than 100 signals visible), or immediately when hovering a marker.

Action	Effect
Wheel	Zoom in / out
Click	Open the signal popup (SNCF data + OSM tags)
Shift + Click	Open popup on the alternate default tab (see Settings)
Ctrl + Click	Pin / unpin the signal; pinned signals appear in Filters
Alt + Click	Zoom to and center on the signal
Right-click	Open context menu
Shift + Click on a pill's ×	Remove all the other pills of the filter and keep this one

Shortcut	Effect
+ / −	Zoom in / out
Home	Reset to initial map extent
F11	Toggle fullscreen
B	Open / close basemap picker
L	Show my location
S	Toggle sidebar
T	Collapse / expand map toolbar
Shift+F10	Open context menu on focused signal
Enter	Open signal popup (Properties)
Shift+Enter on a pill's ×	Remove all the other pills of the filter and keep this one
?	Open help