OH2RCH close to downtown Helsinki, but there have been a few bad GPS fixes:
OH7AA fairly quiet on 144.800, peaks generated by stationary digipeaters:
OH6RDK is a digipeater without any activity within 20 km range (the receiver probably does work at that range, though):
VK2TV-4 has an HF receiver:
As usual, there are a few catches:
- The graphs tell more about the amount of activity within a given distance, than the receiver performance at that range. A receiver in the middle of a big city might hear well from a long distance, but there is simply so much traffic close to the receiver that the linear Y scale of the graph hides the position packets from the distant stations. Maybe I should switch to a logarithmic scale, or would that be too confusing?
- Stations transmitting invalid or fake coordinates will skew the stats. If the transmitting station claims to be 1000 km away (due to a bad GPS fix), my best guess can only be that the station actually is that far away.
- Items and objects are not shown here, since they are usually far away from the transmitter which transmitted the packets.
- AIS support is still in the works, I need to add a method to configure the coordinates of the receiver.