ozice_d_operation.html

wince下的电子地图Ozi Explorer

<p><b><a name="Status line">GPS Info Status line</a> - </b>Shows the position coordinate
on the left and NMEA status and activity on the right. 

<ul>
  <li><strong>&quot;ON&quot;</strong> indicates communication is turned on.</li>
  <li><strong>&quot;NF&quot;</strong> (white text on red)&nbsp; indicates communication is turned on but the GPS 
  has reported it does
    not have a good fix - however it may still be reporting a position.</li>
  <li><strong>&quot; * &quot;</strong> will toggle on and off as NMEA sentences are processed.
  </li>
  <li><strong>&quot; L &quot;</strong> will appear when a track point is logged to disk.</li>
  <li><strong>&quot; T &quot;</strong> will appear when a track point is logged to the screen.
  </li>
  <li><b>&quot;Busy&quot;</b> (white text on blue or green) indicates the software has not 
  finished processing the previous NMEA sentence and a new one has arrived, the 
  new sentence is not processed.</li>
</ul>

<p>The GPS Fix data (<strong>0</strong>-no fix, <strong>G</strong>-GPS fix, <strong>D</strong>-DGPS
fix + number of satellites being tracked) + the DGPS last update time are also displayed
on the status line. </p>

<hr color="#000080">

<p><a name="Moving Map"><b>Moving Map (Real Time Tracking)</b></a> </p>

<p>For Moving Map operation you need a GPS which can output the NMEA sentence $GPRMC,
$GPGGA, $GPGLL, the $GPVTG sentence is also use to obtain additional information if
required. </p>

<p>You need to configure OziCE and select the sentence type your GPS outputs, <strong>if
your GPS outputs $GPRMC always select this one</strong> as it contains most information,
the next best is $GPGGA and then $GPGLL. </p>

<p>Select the highest baud rate you can for communication, <strong>make sure OziCE and the
GPS are both using the same baud rate</strong>. </p>

<p><font color="#800080">Compared to PC's CE devices are very slow and they cannot refresh
the screen, draw the track and waypoints, check for proximity waypoints etc etc etc in the
time between the NMEA sentences, when this happens they start missing characters arriving
from the GPS and scrambling the information, I have not found anyway to protect against
this in code. When this happens bad data is collected and incorrect positions are
calculated usually resulting in the track shooting off the map into oblivion. The other
symptom is the NMEA positions will lag behind your true position.</font></p>

<p><strong><font color="#FF0000"><em>To protect against this you need to : </em></font></strong></p>

<p>1. Increase the time between screen updates to 2 or 3 or more, position data is still
collected, speed is still updated on screen, proximity waypoints are still checked but the
screen is only refreshed each update interval. This is the <font color="#FF0000"><strong>BEST</strong></font>
and preferred method to prevent these problems.</p>

<p>2. Have &quot;Use Chk Sum&quot; (Use Check Sum for NMEA sentences) turned on in NMEA
(GPS) configuration. The checksum will be calculated and compared to the checksum in the
sentence, if they do not agree the sentence will be rejected. This prevents bad data from
being processed but does not prevent the NMEA position from lagging behind you actual
position.</p>

<p>3. Keep the Track Tail length set up in configuration very short, there is a limit of
1000 points but even 100 may cause problems. Turn the screen track off if necessary. </p>

<p>4. Keep the Track Width as narrow as possible, no more than 2 pixels. </p>

<p>5. Have the Screen Track Logging interval set to a reasonably high number so fewer
track points are collected for on screen display, this has the advantage that a shorter
track tail can be used. The logging of track points to disk is independent of this. </p>

<p><strong><font color="#0000FF"><big><em>Changing maps</em></big></font></strong><b> </b>-
A new map will be searched for when the neat line (corner markers) are crossed. The most
detailed map will be selected. If activated in configuration a more detailed map will be
searched for every 90 seconds regardless of current position on the map. The maps are
searched for in the <b>Active </b>Map File paths only (marked as active in configuration).
This allows you to separate you maps into different categories, I keep my touring maps
separate from my marine maps etc. </p>

<p><big><strong><font color="#0000FF"><em>Starting Moving Map</em></font></strong></big> -
Select the Moving map (GPS) option on the Map menu or press the button on the Toolbar. </p>

<hr color="#000080">

<p><a name="Finding Maps"><b>Finding Maps</b></a> </p>

<p>Selecting the <b>Find Map at Cursor</b> option on the Map menu will scan the <strong>folder
where the current Map was loaded from</strong> and the <b>active Map File Paths</b> and
find all the maps which will have the current cursor position contained within them. </p>

<p>A map in the list can be opened - 

<ul>
  <li>by double clicking on it (Map Find dialog will remain), this allows additional maps to
    be viewed quickly if desired.</li>
  <li><strong>or</strong> highlighting it and pressing the OK button (dialog will disappear)</li>
</ul>

<hr color="#000080">

<p><a name="Map Scale"><b>Map Scale</b></a> </p>

<p>Selecting the Scale option on the View menu will display a scale bar on the map. The
number shown on the bar is the distance covered by each segment of the bar (in other words
the number represents the distance covered by the white segment, all segments are the same
size. </p>

<p>The scale bar can be dragged by clicking on it and then dragging the caption, click on
the bar again to hide the caption. The scale bar cannot be rotated. </p>

<hr color="#000080">

<p><a name="Map Zoom"><b>Map Zoom</b></a> </p>

<p>The map can be zoomed by clicking on the magnifying glass buttons on the toolbar or
selecting a zoom option on the view menu. Configure the zoom levels above 40% 
you require in <b>File / Configuration / General Settings / System</b> menu. 
Zoom levels below 40% are always available.</p>

<p>The Full Zoom option means a zoom level will be chosen for the map so it just roughly
fills the screen, the zoom level chosen automatically must be one of those in the zoom
list so the map may just exceed the screen size or be smaller than but it will be close. </p>

<p>The Full Zoom option is so useful it is also available on the Toolbar as a button 
and on the popup menu which can be activated by pressing and holding on the map, the
100% zoom level is also available so you can quickly return to normal zoom.&nbsp; The Full zoom
can be used a little like MapView. </p>

<p>Please Note - Infinite zoom levels will not be made available (technical reasons),
zooming by dragging on the map is not available. </p>

<hr color="#000080">

<p><a name="Map View"><strong>Map View</strong></a></p>

<p>The map view window displays the full map.&nbsp; 

<ul>
  <li>Clicking on the Map View map will scroll the main map to the same position.</li>
  <li>Click on the colored border around the map to display a list of the available maps at
    that position.</li>
  <li>Use the + / - buttons on the MapView window to change the size of the Map 
  View window.</li>
  <li>Use the button with the red dot to turn On/Off the display of Waypoints, 
  Map Features and Map Comments.</li>
</ul>

<hr color="#000080">

<p><a name="Replay"><strong>Replay Track</strong></a></p>

<p>To replay a track select the &quot;Replay Track&quot; option on the File / Track menu
option. Load the track you want to replay. Select the &quot;Moving map (GPS)&quot; option
on the map menu or press the <img src="ozice_b_startgps.gif" width="23" height="24"
alt="Start GPS" border="1"> button on the toolbar. The track will be replayed using the
same configuration settings used for normal moving map operations. To cancel track replay
mode you must select the &quot;Replay Track&quot; menu option again.</p>

<p>The CE track replay option can use track files produced by the full OziExplorer. </p>

<hr color="#000080">

<p><a name="Navigation"><strong>Navigation</strong></a></p>

<p>Navigation can be set up by - 

<ul>
  <li>select a waypoint in the Waypoint List and click the GoTo button.</li>
  <li>create and/or load a route and turn on navigation along the route. Note: 
  this is not auto-routing, you must define the route manually.&nbsp; See the 
  &quot;Working with Routes&quot; section for details.</li>
  <li>select a location in the Name Search dialog and click the Gt button.</li>
</ul>

<p>Navigation information can be displayed on a status bar. It can be turned on or off by
an option on the View Menu.</p>

<hr color="#000080">

<p><b><a name="Speed Monitor">Speed Monitor</a></b></p>

<p>The speed monitor will play wav files when the speed thresholds are crossed. If the wav
files are not found the standard beeps are used. 

<ul>
  <li>Min Speed - The <b>minspeed.wav</b> file is played when the speed goes below the
    specified min speed. The sound will not play again until you go above the set speed and
    then below the min speed again. </li>
  <li>Set Speed - The <b>setspeed.wav</b> file is played when your speed goes above the
    specified set speed. </li>
  <li>Max Speed - The <b>maxspeed.wav</b> file is played when your speed goes above the
    specified max speed. </li>
</ul>

<p>The speeds can be activated independently by ticking the active check boxes. </p>

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