Latest symbol  Digipeater (digipeater is also an IGate)
Latest Packet:
Position Packet
Receive Time:
Latest Forwarded:
Receive Time:
Latest Comment:
5/HSn / Miyoshi Sky Friend Ham Club
Receive Time:
(Received in latest packet)
Latest Status:
No stations have been heard except via a digipeater.
Receive Time:
Latest Position4:
34.7585, 133.065666666667
Receive Time:
(Received in latest packet)
Nearby locations:
Shōbara , Japan 6.91 miles
Miyoshi , Japan 12.57 miles
Fuchūchō , Japan 16 miles
Mihara , Japan 24.79 miles
Latest PHG6:
Power 9 W, Height 89 ft, Gain 5 dB omni
(Calculated range: 14.65 miles)
Packet frequency:
1620s (Latest 10 packets)
Latest symbol
Search for JH4YOP at QRZ.COM!

(Link to

Related stations/objects7:
Nearby stations/objects:
Symbol  JR4QII-10 11.46 miles
Symbol  JN4OQT-10 13.06 miles
Symbol  439.84-HS  (JN4OQT-10) 14.37 miles
Symbol  JH4YOP A  (JN4OQT-10) 15.63 miles
Symbol  JE4YLR-10 25.46 miles
Symbol  JJ4KME-10 25.57 miles
Symbol  JH4AAC-10 27.58 miles
Symbol  JH4AAC-13 27.58 miles
Symbol  JA4YYF-1 29.11 miles
Symbol  JA4YYF-2 29.11 miles
Symbol  JH4UWK-10 30.12 miles
Symbol  JR4VEV-13 33.32 miles
Symbol  JR5WW-I 35.99 miles
Symbol  JH4KWH-10 46.94 miles
Symbol  JI4POR-10 48.05 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.
  7. If station has more than 30 related stations we will only show the 30 closest related stations.
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

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