Name and Location

Alempi linjataulu (Lower Range Marker) is a day-mark navigation beacon located in Porvoo, Uusimaa, Finland. The exact address is Majdalintie 20, 06950 Porvoo.

Construction and History

The Alempi linjataulu is not a traditional lighthouse but a shore-based day-mark that provides line-of-sight guidance to vessels transiting the narrow river channel into Porvoo harbour. Its construction era is unknown, likely erected in mid-20th century when river navigation aids were standardized.

Architecture and Materials

The Alempi linjataulu is a rectangular board mounted on a timber post, approximately 2–3 meters above ground level. It is made of painted wood with a white field and a vertical black stripe (speculation based on typical Finnish range marks).

Light and Navigation

Alempi linjataulu serves as the "lower" element in a two-point range system. Mariners bring the two boards into vertical alignment to ensure they remain centered in the safe, charted channel of Porvoonjoki. As it carries no light, it is effective only by day – vessels use fixed lights on adjacent buoys or quay walls after dusk.

Accessibility and Visiting

The Alempi linjataulu is visible from Majdalintie, but there is no formal access path. The immediate area is private property, but the marker can be viewed safely from the roadside. There are no visitor facilities, signage, or interpretive panels.

Notable Views and Landscape

Technical and Operational Details

The Alempi linjataulu is managed by the Finnish Transport Infrastructure Agency (Väylävirasto). Maintenance involves periodic repainting and structural inspection, typically every 5–10 years. The marker does not have any automation or unmanned operation.

Further Information

• For further reading and links:
• Finnish Transport Infrastructure Agency, "Navigation Aids in Finland" (in English): https://vayla.fi/en/navigation
• Porvoo Harbour user guide (PDF): local marina office
• OpenStreetMap entry: https://www.openstreetmap.org/way/181521485