WA8LMF Mirror of WB4APR Website - 21 July 2008 HOW TO SHOW UP ON AN APRS MAP de WB4APR

HOW TO SHOW UP ON AN APRS MAP                             de WB4APR





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

WA8LMF Mirror of WB4APR Website - 21 July 2008