An observatory code is not optional. MPC computes an ephemeris for a code, so a site without one has no ephemeris and therefore no board. The code is also where the position comes from — MPC's own table, not anything typed here, because it is the position every ephemeris will be computed for.
A new observatory does not inherit another one's limits. Two of these settings describe physical obstructions, and copying one dome's limits onto another telescope is the one mistake here that could point it at a wall.
| Keep-out wedges | none — no sky refused until you say so |
|---|---|
| Horizon mask | eight soft sectors above 20°, every one marked unconfirmed |
| Night boundary | near local noon, from your longitude |
| Everything else | the thresholds recovered from Višnjan's legacy planner |
All of it is editable on the settings page from the moment the site exists, and the mask and wedges are drawn on the sky map as you change them. Changing a wedge asks you to type the observatory code, because a wedge removes sky outright.