|This large passenger boat is actually|
making some turns between the islands.
To limit the performance impact of this feature the DR indicator will be shown for a single station at a time. Click on a station to enable it. It's also enabled automatically for a tracked station.
Naturally it'll show some rather bogus estimations for vehicles which have stopped moving but have not transmitted a new packet with a speed of 0. Most trackers installed in cars loose their power input before they have a chance of transmitting a packet at the parking spot.
|A plane flying at 2648 feet, and the digipeaters|
and igates which have received it.
The circles are useful for estimating the distance at which the station can be heard, which can be of use for tracking teams of high-altitude balloons. It also gives pilots an idea of the large amount of digipeaters and igates in range.
The circles are drawn for stations having a suitable symbol when the altitude is over 100 meters. Other stations will also get the circles when their altitude reaches 1000 meters.