Latest symbol  Digipeater
Latest Packet:
Position Packet
Receive Time:
APMI06 via WIDE3-3,qAR,ED4ZAI-3
Unknown by Microsat
Latest Forwarded:
Receive Time:
Latest Comment:
Receive Time:
(Received in latest packet)
Latest Telemetry:
Latest Position4:
40.418, -3.55316666666667
Receive Time:
(Received in latest packet)
Nearby locations:
Coslada , Spain 941 m
San Fernando de Henares , Spain 1.86 km
Vicálvaro , Spain 4.44 km
Barajas de Madrid , Spain 6.53 km
Latest PHG6:
Power 49 W, Height 6 m, Gain 8 dB omni
(Calculated range: 20.18 km)
Packet frequency:
601s (Latest 9 packets)
Latest symbol
Search for ED4ZAF at QRZ.COM!

(Link to

Related stations/objects7:
Symbol  ED4YAK  (ED4ZAF-3)
Symbol  ED4ZAF
Nearby stations/objects:
Symbol  ED4ZAF 34 m
Symbol  ED4YAK  (ED4ZAF-3) 46 m
Symbol  EA4BLG 2.65 km
Symbol  EA4TD-2 2.73 km
Symbol  EA4TD 2.73 km
Symbol  SOS280007  (EA4RCM-1) 4.9 km
Symbol  SOS280004  (EA4RCM-1) 4.92 km
Symbol  AEMET  (EA4CZ) 5.73 km
Symbol  EA4BPO 6.01 km
Symbol  SOS280005  (EA4RCM-1) 6.11 km
Symbol  EA4TN 7.42 km
Symbol  SOS280003  (EA4RCM-1) 8.75 km
Symbol  EL-EA4GEY  (EA4GEY) 8.91 km
Symbol  SOS280006  (EA4RCM-1) 9.83 km

  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.
  7. If station has more than 30 related stations we will only show the 30 closest related stations.
Initial position
Current position

© 2015-2018 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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