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SCREEN.TXT
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1995-06-22
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SCREEN.txt 6.5c 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 |
| |-------------------------------------------|
|-----------------------| |
| 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 |
---------------------------------------------------------------------
* As of version 6.5, APRS supports highres 43 line VGA mode
and these lines will be 41, 42 and 43 respectively
CURSOR BOX: The cursor box displays the location of the cursor and the map
range. The range shown 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/Range: If the MAPS-PLOTS-RANGE command is given, then the 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 Square: This field will show the Maidenhead Grid Square location of
the cursor when the MAPS-PLOTS-GridSquare command is given.
NatlGridRef: The English version of APRS displays the National Grid
Reference in this box
FLAG AREA: This area is 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/WARNING: Shows the current time, and the time to go before the next
Beacon, Posit, Object or Message packet to be transmitted
from your station. The 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 >9 is shown.
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: This line is the bottom most useable text line that will
not automatically scroll the screen. Its uses:
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 any received BEACON that is new
25th LINE: This line displays monitored packets. It displays the
packet first, and then over-writes a 3 character label
showing how APRS interpreted the packet. Typical labels:
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: A CSMA packet channel with no hidden transmitters nominally
achieves about a 36% throughput, considering acks and
retries. For displaying channel loading, I use that 36%
figure as 100% channel load. THat is why you may sometime
see figures approaching 300%.
No DIGIPEAT... Since APRS is always monitoring the channel, it can tell
if its own packets are being digipeated on the channel. If
it does not hear a digipeat of its transmitted packets, then
it displays a message on the 25th line. On any packet
channel, packets will suffer collisions preventing some
packets from getting through. If you see this message
on everyone of your packets, then there is something wrong
with your transmitter or your chosen UNPROTO path. This
is turned off on HF where there should be NO digis.
+ PLUS 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
RED - WX alarm values exceeded
Purple - OBJECT reported by someone else
Yellow - OBJECTS you are uplinking