Latest symbol  Triangle (DF station)
Latest Packet:
Direction Packet
Receive Time:
APRS+SA (software) by Brent Hildebrand, KH2Z
Latest Comment:
RDF - Base VHF IGate - RX only
Receive Time:
(Received in latest packet)
Latest Status:
[228]:RDF P-Doppler op Boris
Receive Time:
Latest Position4:
50.0508333333333, 14.436
Receive Time:
(Received in latest packet)
Nearby locations:
Vysehrad , Czechia 1.29 miles
Braník , Czechia 1.43 miles
Hodkovičky , Czechia 2.13 miles
Staré Město , Czechia 2.59 miles
Latest PHG6:
Power 36 W, Height 361 ft, Gain 0 dB omni
(Calculated range: 31.08 miles)
Packet frequency:
131s (Latest 17 packets)
Latest symbol
Search for OK7W at QRZ.COM!

(Link to

Nearby stations/objects:
Symbol  EW9202 879 yd
Symbol  OK1VCF-8 1.06 miles
Symbol  OK1COM-9 1.86 miles
Symbol  OK1COM-1 1.88 miles
Symbol  OK1CNN-9 1.89 miles
Symbol  EL-OK1MDX 2.09 miles
Symbol  438.950PR 2.21 miles
Symbol  DW5785 2.77 miles
Symbol  OK0ND 2.84 miles
Symbol  OK0DBY-ND 2.94 miles
Symbol  OK0HCS-B 3 miles
Symbol  OK0HCS B 3 miles
Symbol  PrahaLibu 3.02 miles
Symbol  OK1LOL-1 3.08 miles
Symbol  OK1KZE-6 5.11 miles

  1. A packet is either recived from the regular APRS-IS servers or from the CWOP servers. Packets received from the APRS-IS servers are sent from ham radio operators, and packets received from the CWOP servers are sent from citizen weather stations.
  2. To get a better understanding of the APRS path I recommend reading the explanation written by wa8lmf.
  3. Used Aprs Device according to the APRS device identification database.
  4. Position accordning to the Google geocoding service, based on the reported latitude and longitude (if we get no valid position from the Google gecoding service we will show the latitude and longitude).
  5. This is the Maidenhead Grid Square Locator, used by ham radio operators to specify a location (using few characters).
  6. PHG stands for Power-Height-Gain (and directivity). The height is not the height above sea-level, it is the height above average terrain (HAAT = Height Above Average Terrain). PHG is used to calculate the relative RF range of a station. If this station has reported several positions or symbols the PHG data will only be used for the position and symbol used in the PHG-packet.
Initial position
Current position

© 2015-2019 Per Qvarforth SM4WJF
All Rights Reserved

In this tab we show all APRS packets of any packet type that has been added to the map.

In this tab we show APRS packets of type position that has been added to the map (note that any station may send a position packet).

In this tab we show all APRS packets of type object or item that has been added to the map.

In this tab we show APRS packets of type weather that has been added to the map (note that any station may send a weather packet, not only weather stations).

In this tab we show APRS packets of type direction finding, telemetry, message, query and status that has been added to the map.

Select date and time to show map data for (enter time for your locale time zone). The regular time length select box can still be used to select how old data that should be shown (relative to selected date and time).

*Note that the heatmap will still based on data from the latest hour (not the selected date and time).

Date and time:


APRS Direct

Current time is:


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