checklos.online

Line-of-sight and radio coverage maps

Click anywhere on the map and see, in seconds, what can be seen from there — and where a radio link will work. The ground is real terrain, with the measured height of every forest and tree line, and buildings.

Viewshed from any point

Everything visible from your point out to 150 km, as a map: how far below your eye each place is, separate visible areas, Earth curvature and refraction included.

Real trees and buildings

Measured tree heights (Meta & WRI satellite canopy map) across Lithuania, mapped woodland elsewhere, and buildings from OpenStreetMap — the things that actually block the view.

Radio coverage

Received signal, link margin, path loss and Fresnel clearance over the whole area, for your frequency, power, antennas and heights. Hover anywhere for the numbers.

Path profile

The ground between two points with the sight line, trees, the Fresnel zone and a full link budget: will this link work, and what is in the way.

Weather for flying

Wind at several heights, gusts, icing height, cloud base and thickness for the next three days, over the same map.

For

Drone and FPV pilots, radio amateurs, LoRa and Meshtastic networks, antenna and mast placement, observation points — anyone who needs to know what can see what.

Viewshed from a 25 m mast in Lithuania: visible ground coloured by how far below the eye it is, cut off by forests — Line of sight from a 25 m mast: colours show how far below your eye the visible ground is; the forests cut it off.

Radio coverage map at 868 MHz: received signal in dBm around a transmitter, with a read-out of signal, margin and distance — Radio coverage at 868 MHz: received signal everywhere around the transmitter, with the numbers under the pointer.

Path profile with trees, Fresnel zone and link budget.