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Ham Radio 2000 #2
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APRS805
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SCREEN.TXT
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1997-05-20
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SCREEN.txt ver 7.6b THE APRS MAP SCREEN
This file was written to describe some of the subtleties of the APRS
main map screen. There are several distinct areas where information
appears. They can be grouped as follows:
--------------------------------------------------------------------+
| CURSOR BOX | FLAG AREA | TIMING/WARNING AREA |
| +---------------------+---------------------|
|-----------------------+ | MODES AREA |
| Brg/Rng & Grid Square | +---------------------|
|-----------------------+ + |
| + |
| |
|-------------------------------------------------------------------|
| TO CALL : Outgoing message lines (use ERASE to delete them) |
|-------------------------------------------------------------------|
| FM CALL : Incomming message lines (use KILL to delete them) |
|-------------------------------------------------------------------|
| 23rd line * | Heard |
| 24th line * |
| 25th line * | Channel load, etc |
---------------------------------------------------------------------
* APRS supports highres 43 line VGA mode
and these lines will be 41, 42 and 43 respectively
CURSOR BOX: Displays the location of the cursor and map range.
The range is roughly the Nautical mile radius from the
center of the screen to the top of the screen.
Toggle range in Kilometers with the CONTROLS-KM command.
Bearing/: If MAPS-PLOTS-RANGE command is given, then the RANGE
Range and BEARING of the cursor from the center of the screen
will be shown in STATUTE miles. The outer concentric
circle is equal to the indicated map range scale in STATUTE
miles. The Bearing is shown as the GREAT-CIRCLE bearing.
To see the difference, at ranges above 1000 miles, a yellow
heading marker shows the actual great circle bearing.
Grid Sq: Shows the Maidenhead Grid Square of the cursor when
MAPS-PLOTS-GridSquare command is given.
NGR: Displays the National Grid Reference in ENGLAND only.
FLAGS: For warnings and annoncements as follows:
1) Shows weather reports in response to the NEXT-WX command.
2) Announces new bulletins have been received
3) Announces DX Cluster monitoring mode
TIMING/: Current time, and time to go before next Beacon, Posit,
WARNINGS Object or Message packet is to be transmitted. Time to go
is in minutes until it gets below 99 seconds, and then it
shows in seconds. If the time to go is greater than 9
minutes, then '# is shown for 10-19, "# for 20-29, ≡# for
30-39, f# for 40-49, and »# for 50-59. This display is
only updated about once every 5 seconds. Other displays:
1) trapped errors (file errors etc...)
2) indicator whenever GPS or other data is being fetched
3) The box shows purple when your XMTR is disabled.
23rd LINE: Used for text input:
1) All prompts that require more than one character response
2) The bottom line of the split screen message display
3) Displays CALLSIGN/DIGIPATH and HEARD log for HOOKED stns
24th LINE: Captures received packets that are NEW
25th LINE: All monitored packets. After displaying the raw packet, it
then over-writes a 3 character label showing how APRS
interpreted the packet:
BCN: Processed to the LATEST BEACON page
POS: Processed as a POSIT
MSG: Message
APR: Other APRS formats such as ACKS
Hrd: Neither of the above
GGA,GLL,RMC,VTG: The packet had a NMEA string in it
To? means the TO field did not match one of the following
APRS,BEACON,CQ,QST,MAIL,SKYWARN,SPCL,GPS
No> Couldnt find the packet >TO field identifier
BLANK:If your packets only blink and then go blank, then
there is a problem with extra linefeeds.
Channel Load: Assuming 36% is the theoretical maximum throughput on a
CSMA packet channel with no hidden transmitters, APRS uses
this 36% figure as 100% channel load. THat is why you may
sometime see figures approaching 300%.
No DIGIPEAT... APRS alerts you if it does not see a digipeat of its own
packets. Due to collisions, you will occassionally see this
message. If you see it all the time, then there is probably
something wrong with your station or your UNPROTO path.
This is turned off on HF where there should be NO digis.
+ symbols: On maps, these mark the center of each map. If they appear
yellow, then that map is visible at the present screen
range. If they are white, then you must zoom down one step
to see the indicated map. Remember, however, that APRS
will not use a map until the ENTIRE screen will fit on the
given map. That is why the + symbols are useful, by
zooming in near them, you will see the more detail map
at its largest practical range. To see the true extent of
each map file, use the MAPS-LOCK command and then zoom back
out.
Symbol Colors: White - Active APRS stations
Gray - TNC on-line, but APRS is not running
Dark Gray - Has not been heard in 2 hours
Green - APRS WIDE area digi
Blue - WX stations
Lght Blue - Dead Reckoned station
Dark Blue - Erased posit (replaced by a new posit)
RED - WX alarm values exceeded
Purple - OBJECT reported by someone else
Yellow - OBJECTS you are uplinking