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Режим движения по карте (Moving Map)
See also - Moving Map Control Moving Map Menu Configuration
Introduction
When your GPS is connected directly to a computer and the GPS is transmitting the NMEA
$GPRMC or ($GPGGA and $GPVTG) or ($GPGLL and $GPVTG) sentence OziExplorer can plot your
location directly onto the map on screen in real time, this is called "Moving
Map". You must have a calibrated map available which covers the position the GPS is
transmitting.
For testing it is possible to set your GPS to simulator mode and then specify within
the GPS a position where the GPS is located. It is also possible to specify a direction
and speed of travel within the GPS. You will need to consult you GPS manual on how to set
your GPS into simulator mode. A software simulator is also provided in OziExplorer and
details on how to use this are provided below.
Moving Map has the following features.
Ability to automatically change maps when your position moves off the current map or
across the map "neat lines", requires Moving Map options to be set for each map.
The "neat lines" (corner markers) are set up in "Check Map
Calibration".
OziExplorer can be set to scan for more detailed maps at configured intervals and load a
more detailed map if one is available, Note - you do not have to cross the map "neat
line" for this to occur.
Ability to show the track onscreen and log it direct to a file.
Ability to sound and show alarms when approaching waypoints.
Ability to sound and show alarms when entering Alarm Zones.
Ability to navigate along a predefined route or to a specific waypoint, see Navigation.
Setting up Maps for Use with Moving
Map
When you move off the current map OziExplorer will search through the available maps
and select a map which can show the GPS position and provides the best scale. If a
suitable map cannot be found OziExplorer will wait 15 seconds and search again, then 30
seconds and search again and then 60 seconds between searches.
Maps are setup for Moving Map in the map calibration screen. See the Moving Map Options of the Creating Maps help
for details and explanation.
To use moving map your GPS must output certain NMEA sentences in the 0183 format. The
required sentence(s) are :
$GPRMC (preferred) or
($GPGGA and $GPVTG) or
($GPGLL and $GPVTG).
Most GPS receivers can output the required sentences but most require configuring. You
may need to refer to your owners manual for the method.
Some Garmins have the capability of outputting the required information using the PVT
format, this is also supported by OziExplorer and this option is turned on in the Comm Tab
in Configuration.
The GPS needs to be connected to the serial port of the PC.
Starting Moving map
If you have everything setup correctly Moving Map can be started by selecting the Start
NMEA Communication with the GPS option on the Moving map Menu. Alternatively (and
preferred) you can activate the Moving map
Control and press the Start button.
If it is working ok you should see some indication on the Status Line at the bottom of
the map. See the Status Display section below.
If it is not working as expected see the Trouble Shooting section in the Help Index.
To allow moving map to be automatically started when starting OziExplorer the following
command line parameters are available. Note, the / is part of the parameter name.
The following command line parameters can be used when starting OziExplorer
/mmstart - Starts Moving Map (NMEA) communication
/mmcontrol - Shows the Moving Map Control
/navcontrol - Shows the Navigation Control
/gpsfix - Shows the GPS Fix window
example command lines
oziexp.exe /mmstart /mmcontrol /navcontrol /gpsfix
oziexp.exe /mmstart
oziexp.exe c:\oziexplorer\maps\mymap.map /mmstart /mmcontrol
Note that you can specify a map on the command line but if the GPS position is not on
that map or the map has not been specified as available for Moving Map OziExplorer will
attempt to find a new map.
Status Display
The status line at the bottom of the screen displays the following.
The left hand panel will show "Moving Map is ON" when you start the NMEA
communication. It does not have to be receiving data from the GPS to display this message.
The panel will show a <+> symbol which will toggle on and off when actual data is
being processed. If you see the plus sign it means the correct data is being received and
processed for display on the map, if you do not see the <+> symbol something is not
right. If the <+> symbol is not being toggled on and off data is not being
processed.
The next panel will display the following, these should be toggled on and off when data
is being received.
<nmea> when any type of nmea data is being received.
<gprmc> if the $GPRMC nmea sentence is being received, other sentences being used
have a similar code.
<no fix> if the data in the $GPRMC nmea sentence is invalid (no fix or on some GPS
units the unit may be being operated in simulator mode).
< pvt > if using PVT mode for Garmins which support it.
The right panel displays the position of the GPS.
The time displayed to the right of the position is the time the last position was
received, this indicates how old the position fix is.
The Track
The track used by Moving Map is always Track 1. Note that if there is already a track
loaded into track 1 and moving map is started the track collected by moving map will be
appended to the existing track.
The track is automatically captured and can be displayed by the usual Show/Hide
Track Plot button on the button bar.
See the Navigation Tab on the Configuration dialog for setting up the intervals at
which the track points are captured and stored. The configuration help has details on this
feature. Note - capturing of the track is disabled when the interval is set to zero
(0).
The track can be saved and loaded the same as any track, and it can be saved at any
time to any name.
The track can be automatically saved to a file mmTrack.plt if the option is
turned on in Configuration. The track is always appended to this file even when starting
new moving map sessions and the file will keep growing in size. An option is provided on
the Moving Map menu to clear this file. The track file mmTrack.plt is a normal
OziExplorer track file and can be loaded and displayed on a map as normal. Each moving map
session is treated as a separate track segment.
The time collected and stored for a track is the UTC time extracted from the NMEA
sentences but the date used is the PC date. This is necessary as not all NMEA sentences
provide the date. Note that the time initially used to log track points may be the PC time
until a time has been collected from the NMEA sentence.
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