WA8LMF Mirror of WB4APR Website - 21 July 2008
HOW TO SHOW UP ON AN APRS MAP de WB4APR
AND HOW TO BE SEEN BY Kenwood MOBILES and HT’s:
APRS only has three types of packets, POSITION, STATUS and Messages.
MESSAGES: APRS messages are easy. Just begin your packet line with a
Colon, a 9 character TOADDRESS and another colon and then the text.
Example: :ALL------:Everyone will capture this 64 byte message text.
The “------“ are six blank spaces to pad the 9 character TOCALL field.
We use ALL, because if you use individual callsigns, then ONLY that
Person will see the message, and all other Kenwoods will totally
Ignore the packet. This is not good for just reading the mail.
POSITION: The simplest human generated APRS position report is to include
a gridsqare in your packet. The easy way for this to show up in all of
your packets is to put it in your UNPROTO path. There are a few other
suggestions that will assure that your packet is visible by the
largest number of monitoring stations.
1) Include either your Gridsquare or Name in your UNPROTO path:
UNPROTO CQ VIA ARISS,GG##GG ç GG##GG is your gridsquare
UNPROTO CQ VIA ARISS,GG##GG,Bryant ç To also include your name
2) Use the TOCALL of CQ as shown above so that Kenwoods and many versions
of APRS software will not ignore your packets as being to someone else.
STATUS: At the start of each line, type a “>” character at the beginning of
your text. This causes the packet to be recognized as an APRS STATUS
type packet and it will thus be captured on all APRS systems, including
the Kenwood radios for display. For example:
Hi All. Kenwood guys| won’t s|ee this…
>Hi all, includng you| kenwood| guys…
Using the above steps will assure that the largest number of people
Listening to the downlink will see your packets. The vertical marks
Show the 20 and 28 character limit of what is displayed on the HT and
on the Mobile rig. Another thing that is missing is that the non (G)
model Kenwoods will not parse the grid Position, although they will
display it. We hope all other APRS software will too. Also, you cannot
send your Type of station ICON this way.
POSITION AND STATUS: The best way to send a packet including GRID SQUARE
and ICON and status is to type the format >GG##GG/- … at the start of
every line. This transmits the GRID and your ICON (/-) in the standard
APRS format for display on all systems including the 20 or 28 character
A subset of those ICONS thought to be useful for this ISS experiment
are listed below. To appear as something other than a HOUSE, simply
replace the "/-" shown in the example grid square example with
one of the following pairs:
/- House with VHF vertical* \- House with HF dipole*
\+ Church /+ Red Cross
/, Boy Scouts \, Girl Scouts
/; Campground* \; Park/Picnic area*
/< Motorcycle* /= RAILROAD ENGINE
/> CAR* /C Canoe
\C Coast Guard /E EYEBALL
/H HOTEL /K School
\L Lighthouse /` Dish Antenna
/N NTS Station \N Floating Buoy
/O BALLOON /* SnowMobile
/R REC. VEHICLE* \R Restaurant
/S SHUTTLE \S Satellite/Pacsat
/T SSTV* /U BUS*
/V Amateur TV* /X HELO
/Y Sailboat* /[ Jogger, walker or runner*
/^ LARGE AIRCRAFT* /' Small AIRCRAFT
/a AMBULANCE* \a ARRL ARES etc
/b BIKE* /d Fire dept
/e HORSE /f FIRE TRUCK*
/g Glider /h HOSPITAL
\h HAM store /i IOTA (islands on the air)
/j JEEP* /k TRUCK*
/o EOC /p ROVER (puppy)
/r ANTENNA /s SHIP (power boat)*
/u TRUCK (18 wheeler)* /v VAN*
(*) NOTE. The subset of ICONS marked with a (*) will actually
show on the Kenwood D7 and D700 front panel displays.
For more information about APRS on the International Space Station, see the APRS-ON-ISS-FAQ file