Latest symbol  Digipeater (New n-N Paradigm digi)
Latest Packet:
Position Packet
Receive Time:
APNK01 via WIDE1-1,qAR,JQ1ZAB-10
TM-D700 (rig) by Kenwood
Latest Forwarded:
Receive Time:
Latest Comment:
W1,W2 Mt.TSUKUBA 144.66MHz 1200bps
Receive Time:
(Received in latest packet)
Latest Position4:
36.2191666666667, 140.12
Receive Time:
(Received in latest packet)
Nearby locations:
Tsukuba , Japan 1.73 miles
Sakuragawa , Japan 2.18 miles
Makabe , Japan 3.47 miles
Iwase , Japan 9.11 miles
Latest PHG6:
Power 9 W, Height 640 ft, Gain 3 dB omni
(Calculated range: 34.83 miles)
Latest symbol
Search for JJ1YDX at QRZ.COM!

(Link to

Nearby stations/objects:
Symbol  JP1YJZ-I 90 yd
Symbol  7N2CCK-2 8.44 miles
Symbol  JP1YLF-I 15.6 miles
Symbol  JI1KIW 15.73 miles
Symbol  JP1YLJ-I 15.74 miles
Symbol  JP1YLT-I 18.11 miles
Symbol  JA1KWV-11 21 miles
Symbol  JP1YIK-I 21.57 miles
Symbol  JL1LCW-13 22.27 miles
Symbol  JN1NVQ 22.36 miles
Symbol  JI1SZR-10 23.32 miles
Symbol  JJ1GTB-P 24.56 miles
Symbol  JP1YJR-I 24.66 miles
Symbol  JP1YLB-I 24.92 miles
Symbol  7K3LHX-10 25.83 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:


Station filter

Loading Loading
Searching Searching