+Layers supported by &appname; are:
+</para>
+<itemizedlist>
+<listitem><para><xref linkend="Aggregate"/></para></listitem>
+<listitem><para><xref linkend="TrackWaypoint"/></para></listitem>
+<listitem><para><xref linkend="GPS"/></para></listitem>
+<listitem><para><xref linkend="DEM"/></para></listitem>
+<listitem><para><xref linkend="Coordinate"/></para></listitem>
+<listitem><para><xref linkend="Maps"/></para></listitem>
+<listitem><para><xref linkend="GeoRef"/></para></listitem>
+</itemizedlist>
+<para>
+For each layer there are a few standard options:
+</para>
+<itemizedlist>
+<listitem><para>Properties - Layer setup / configuration settings</para></listitem>
+<listitem><para>Cut</para></listitem>
+<listitem><para>Copy</para></listitem>
+<listitem><para>Paste</para></listitem>
+<listitem><para>Delete</para></listitem>
+<listitem><para>Visibility - This checkbox on the Layers Panel controls whether the layer is shown in the viewport or not</para></listitem>
+</itemizedlist>
+<para>
+The cut/copy/paste options can be accessed in a variety of ways once the layer has been selected:
+</para>
+<itemizedlist>
+<listitem><para>Standard keys: <keycap>Ctrl+x|c|v</keycap></para></listitem>
+<listitem><para>Main menu <guimenuitem>Edit</guimenuitem></para></listitem>
+<listitem><para>From the right click menu</para></listitem>
+<listitem><para>Buttons at the bottom of the Layers Panel</para></listitem>
+</itemizedlist>
+<para>
+Default values used for each layer's properties can be altered via the <menuchoice><guimenu>Edit</guimenu><guisubmenu>Layer Defaults</guisubmenu></menuchoice> menu options.
+</para>
+<para>
+See the individual section for detail about each layer.
+</para>
+</section>
+
+<section id="TrackWaypoint" xreflabel="TrackWaypoint"><title>TrackWaypoint Layer</title>
+<para>
+TrackWaypoint layers display GPS data (tracks, routes and waypoints).
+</para>
+<para>One way to create new waypoints is to copy a
+latitude/longitude coordinate pair, such as the one shown on most
+geocaches, and paste it into an active TrackWaypoint layer. &appname; can
+automatically recognize several variations of the lat/lon format.
+</para>
+<para>
+By right-clicking on tracks, routes or waypoints in the <xref linkend="gc_layers_panel"/>, you can access many commands on them.
+You can easily find a specific track, route or waypoint by expanding the appropriate containing Tracks, Routes or Waypoints sublayer in the
+layers panel to show all the individual items and then typing the name of the track, route or waypoint.
+</para>
+
+<para>
+The containing Tracks, Routes or Waypoints sublayers are only shown when items of that type exist.
+To start creating them enter into a create mode via either the <guibutton>Create</guibutton> toolbar commands or the <guimenuitem>New</guimenuitem> menu commands.
+</para>
+
+<para>
+The sublayers also offer right click menu options.
+These are the same as those available at the TrackWaypoint level, but only those that relate to the sublayer type.
+</para>
+
+<para>
+By default routes are coloured red. Tracks are automatically assigned a spread of colours.
+</para>
+
+<para>
+Most operations available on tracks are available on routes, except for functionality that relies on having timestamps - since routes by definition have no timing information. Thus for example, uploading a route to OpenStreetMap Traces is not available nor is Geotagging on a route.
+It is possible to convert between Tracks and Routes, although converting from a Track to a Route may involve a loss of information (hence you are required to confirm this operation before it happens).
+</para>
+
+<section><title>Layer Operations</title>
+<para>
+The layer has a context menu with several operations.
+</para>
+
+<section><title>View Layer</title>
+<para>
+Version1.1+: This will automatically move the viewport and select the best zoom level to see the whole layer (i.e. all tracks, routes and waypoints).
+</para>
+</section>
+
+<section><title>View</title>
+
+<section id="track_view_all"><title>View All Tracks</title>
+<para>
+Version1.1+: This will automatically move the viewport and select the best zoom level to see the all the tracks in the layer (ignoring positions of any routes or waypoints).
+</para>
+</section>
+
+<section id="route_view_all"><title>View All Routes</title>
+<para>
+Version1.4+: This will automatically move the viewport and select the best zoom level to see the all the routes in the layer (ignoring positions of any tracks or waypoints).
+</para>
+</section>
+
+<section id="wp_view_all"><title>View All Waypoints</title>
+<para>
+Version1.1+: This will automatically move the viewport and select the best zoom level to see the all the waypoints in the layer (ignoring positions of any tracks or routes).
+</para>
+</section>
+
+</section>
+
+<section><title>Goto Center of Layer</title>
+<para>
+This will automatically move the viewport to see the whole layer (i.e. tracks, routes and waypoints). It does not adjust the zoom level.
+</para>
+</section>
+
+<section id="wp_goto"><title>Goto Waypoint</title>
+<para>
+This opens a dialog box to enter a name of waypoint to search for. If it is found the viewport is centred on it.
+</para>
+<note>
+<para>
+Note this search is not very clever and only finds exact matches.
+You are probably better off expanding the waypoint list and directly start typing, as mentioned above, which finds a match based on each letter typed.
+</para>
+</note>
+</section>
+
+<section><title>Export Layer</title>
+<para>
+The layer (all tracks, routes and waypoints) can be exported to a file GPX, GPSPoint, GPSMapper or Google's KML format.
+</para>
+<para>
+Version1.1+: An individual track can be exported to a GPX file via the track menu.
+</para>
+</section>
+
+<section id="finish_track"><title>Finish Track or Route</title>
+<para>
+Selecting this option ends the creation of that individual track or route.
+</para>
+<note>
+<para>
+This is only available when a track or route is being created by the <xref linkend="track_create"/> or <xref linkend="route_create"/> tools.
+</para>
+</note>
+</section>
+
+<section><title>New</title>
+<section id="new_wp"><title>New Waypoint</title>
+<para>
+This opens a dialog box to create a new waypoint. A default name will be suggested and the default position is the center of the viewport.
+</para>
+</section>
+<section id="new_track"><title>New Track</title>
+<para>
+This turns on the <xref linkend="track_create"/> tool.
+</para>
+</section>
+<section id="new_route"><title>New Route</title>
+<para>
+This turns on the <xref linkend="route_create"/> tool.
+</para>
+</section>
+</section>
+
+<section><title>Geotag Images</title>
+<para>
+This starts the Geotagging Images dialog against all tracks in the layer.
+See <link linkend="geotagging">Geotagging</link> for further detail.
+</para>
+</section>
+
+<section><title>Acquire</title>
+<para>
+This offers the same choice from <xref linkend="acquire"/> methods as on the <guimenu>File</guimenu> menu.
+However when invoked from here, the results will be stored in this layer (instead of creating a new one).
+</para>
+</section>
+
+<section><title>Upload</title>
+
+<section id="gps_upload"><title>Upload to GPS</title>
+<para>
+This opens a dialog to select the GPS Device and port to which the layer information will be transferred.
+</para>
+<para>
+The types of GPS information (tracks, routes or waypoints) to be transferred can be selected.
+</para>
+<para>
+Tracks, Routes or Waypoints that are invisible will not be transferred.
+</para>
+</section>
+
+<section id="osm_upload" xreflabel="Upload To OSM" ><title>Upload To OSM</title>
+<para>
+This opens a dialog to upload all tracks and waypoints to <ulink url="http://openstreetmap.org/">OpenStreetMap</ulink> traces.
+Useful if you are an OpenStreetMap contributor (you will need an OpenStreetMap account), these details can be stored in &appname; <xref linkend="prefs_osm"/>
+</para>
+<para>
+ &appname; allows you to edit a track, e.g. remove duplicate points, perhaps remove track points leading to your home and then upload it to OpenStreetMap.
+</para>
+<warning>
+<para>
+The password is transferred <emphasis role="bold">unencrypted</emphasis> in every request sent to the OpenStreetMap server. This is due to the use of OpenStreetMap's basic authentication method.
+</para>
+<para>Currently &appname; does not support the <ulink url="http://oauth.net/">OAuth</ulink> mechanism.</para>
+</warning>
+</section>
+
+</section>
+
+<section><title>Delete</title>
+<para>Offers deletion of various parts of a TrackWaypoint layer:</para>
+<section id="delete_all_tracks"><title>Delete All Tracks</title>
+<para>Deletes all the tracks in this layer.</para>
+</section>
+<section id="delete_selection_tracks"><title>Delete Tracks from Selection</title>
+<para>Opens a dialog with list of all the tracks from this layer to choose the ones to delete.</para>
+</section>
+<section id="delete_all_routes"><title>Delete All Routes</title>
+<para>Deletes all the routes in this layer.</para>
+</section>
+<section id="delete_selection_routes"><title>Delete Routes from Selection</title>
+<para>Opens a dialog with list of all the routes from this layer to choose the ones to delete.</para>
+</section>
+<section id="delete_all_waypoints"><title>Delete All Waypoints</title>
+<para>Deletes all the waypoints in this layer.</para>
+</section>
+<section id="delete_selection_waypoints"><title>Delete Waypoints from Selection</title>
+<para>Opens a dialog with list of all the waypoints from this layer to choose the ones to delete.</para>
+</section>
+</section>
+
+<section><title>Filter</title>
+<section><title>Simplify All Tracks</title>
+<para>
+This opens dialog to request the number of points each track will be simplified using <application>GPSBabel</application>. The result is put into a new layer. The simplification method removes points considered to be in a 'near straight line', thus reducing the number of points and attempting to keep the most important turning points.
+</para>
+</section>
+<section><title>Remove Duplicate Waypoints</title>
+<para>
+Remove Duplicate Waypoints - fairly self explainatory, with the results created in a new layer.
+</para>
+<note>
+<para>
+However it only considers a precise position (waypoints only 1 metre away from each other are considered different) and also doesn't consider if the waypoints have different comments, symbols or images.
+</para>
+</note>
+</section>
+</section>
+
+<section id="filter_with_track"><title>Filter With <emphasis>Trackname</emphasis></title>
+<para>
+This runs <application>GPSBabel</application> on the layer using information from a previously selected track (select via the track menu "Use With Filter" option) with the following command types:
+</para>
+<itemizedlist>
+<listitem><para>Waypoints Inside This</para></listitem>
+<listitem><para>Waypoints Outside This</para></listitem>
+</itemizedlist>
+<para>
+The result is generated in a new Track/Waypoint layer.
+</para>
+</section>
+
+<section><title>Geotag Images</title>
+<para>
+This starts the Geotagging Images dialog using the specific track.
+See <link linkend="geotagging">Geotagging</link> for further detail.
+</para>
+</section>
+
+<section><title>List Tracks or Routes</title>
+<para>
+Opens a new dialog with the list. As described in the Aggregrate layer <xref linkend="track_list"/>
+</para>
+</section>
+
+<section><title>List Waypoints</title>
+<para>
+Opens a new dialog with the list. As described in the Aggregrate layer <xref linkend="waypoint_list"/>
+</para>
+</section>
+
+</section><!-- End TRW Layer Options -->
+
+<section><title>Track and Route Sublayer Options</title>
+<para>Repeats options available at the TrackWaypoint level, but only those for tracks and routes:</para>
+<itemizedlist>
+<listitem><para>Finish Track or Route. Same as the layer <link linkend="finish_track">Finish Track or Route</link></para></listitem>
+<listitem><para>New Track or Route. Same as the layer <link linkend="new_track">New Track</link> or <link linkend="new_route">New Route</link></para></listitem>
+<listitem><para>View All Tracks or Routes. Same as the layer <link linkend="track_view_all">View All Tracks</link> or <link linkend="route_view_all">View All Routes</link></para></listitem>
+<listitem><para>Delete All Tracks or Routes. Same as the layer <link linkend="delete_all_tracks">Delete All Tracks</link> or <link linkend="delete_all_routes">Delete All Routes</link></para></listitem>
+<listitem><para>Delete Tracks or Routes from Selection. Same as the layer <link linkend="delete_selection_tracks">Delete Tracks from Selection</link> or <link linkend="delete_selection_routes">Delete Routes from Selection</link></para></listitem>
+<listitem><para>List Tracks or Routes. Opens a new dialog with the list. As described in the Aggregrate layer <xref linkend="track_list"/></para></listitem>
+</itemizedlist>
+<para>Also gives other options for handling multiple items:</para>
+<itemizedlist>
+<listitem><para>Sort. Gives the ability to sort the items in the treeview alphabetically</para></listitem>
+<listitem><para>Visibility. Offers options to quickly control the visibility of all items within the sublayer, as per <xref linkend="vis_options"/></para></listitem>
+</itemizedlist>
+</section>
+
+<section><title>Track and Route Properties</title>
+<para>
+Show many useful statistics about a track or a route, including a
+elevation-distance graph and a speed-time graph (if data is available).
+You can click these graphs to jump to the point in the track. You can
+also reverse it, delete duplicates, and split a track from its
+component segments (discontinuous breaks in a track) into separate
+tracks.
+</para>
+<para>
+The following colors are used in the elevation-distance graph:
+</para>
+<variablelist>
+<varlistentry>
+<term><emphasis>Main</emphasis> colour - this is dependent on your Desktop theme - often blue by default</term>
+<listitem><para>elevation data in graph</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>Yellow</term>
+<listitem>
+<para>no elevation data</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>Green</term>
+<listitem>
+<para>elevation data from DEM</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>Red</term>
+<listitem>
+<para>speed</para>
+</listitem>
+</varlistentry>
+</variablelist>
+
+</section>
+
+<section><title>Track and Route Operations</title>
+
+<section><title>Finish Track</title>
+<para>
+Selecting this option ends the creation of the individual track.
+</para>
+<note>
+<para>
+This is only available when a track is being created by the <xref linkend="track_create"/> tool.
+</para>
+</note>
+</section>
+
+<section><title>Goto</title>
+<para>
+This centers the viewport on the selected position on the track:
+</para>
+<itemizedlist>
+<listitem><para>Startpoint</para></listitem>
+<listitem><para>"Center" - the notional center from the bounds of the track</para></listitem>
+<listitem><para>Endpoint</para></listitem>
+<listitem><para>Version1.1+: Highest Altitude</para></listitem>
+<listitem><para>Version1.1+: Lowest Altitude</para></listitem>
+<listitem><para>Version1.1+: Maximum Speed (Not Available on Routes)</para></listitem>
+</itemizedlist>
+</section>
+
+<section><title>View</title>
+<para>
+Version1.1+: This centers the viewport on the track and selects the best zoom level to see it.
+</para>
+</section>
+
+<section><title>Combine</title>
+<section><title>Merge By Time</title>
+<para>
+This operation repeatedly tries to merge the right-clicked track
+with tracks in the same TrackWaypoint layer. The tracks which are
+merged are those which have at least one trackpoint less than some
+threshold time away. This way, if you somehow end up with lots of small
+segments (say, caused by turning the GPS on and off) you can merge them
+easily into one track.
+</para>
+<note>
+<para>
+This is not available on routes as they have no timestamps.
+</para>
+</note>
+</section>
+
+<section><title>Merge With Other Tracks</title>
+<para>
+This opens a dialog listing the other tracks in the same TrackWaypoint layer, from which one can select the other tracks to merge with.
+</para>
+</section>
+
+<section><title>Merge Segments</title>
+<para>
+Combines track segments. Effectively removing track segment markers to leave one segment for the whole track.
+</para>
+</section>
+
+<section><title>Append Track or Route</title>
+<para>
+Enable joining of a single track to the end of the current track.
+This opens a dialog listing the other tracks in the same TrackWaypoint layer from which one can make the selection.
+</para>
+</section>
+</section>
+
+<section><title>Split</title>
+<section><title>Split By Time</title>
+<para>
+This operation will split a single track into segments wherever the
+time interval between successive trackpoints is larger than some
+threshold. This is useful when processing raw NMEA GPS data, especially
+taken over a long time.
+</para>
+<note>
+<para>
+This is not available on routes as they have no timestamps.
+</para>
+</note>
+</section>
+
+<section><title>Split By Number of Points</title>
+<para>
+Version1.2+: This operation will split a single track into segments by the number of points specified.
+This can be useful with devices which may have limits on the number of points it supports.
+</para>
+</section>
+
+<section><title>Split Segments</title>
+<para>
+Splits track segments into new tracks.
+</para>
+<note>
+<para>
+This is not available on routes as they do not have route segments.
+</para>
+</note>
+</section>
+
+<section id='trkpt_split' xreflabel="Split at Trackpoint"><title>Split at Trackpoint</title>
+<para>
+Splits the track at the currently selected trackpoint.
+</para>
+<para>
+The current track will finish at this trackpoint.
+A new track will start from a copy of this trackpoint.
+</para>
+<note>
+<para>
+This is only enabled when a trackpoint is selected.
+</para>
+</note>
+</section>
+</section>
+
+<section><title>Insert Points</title>
+<note>
+<para>
+These options are only enabled when a trackpoint is selected.
+</para>
+</note>
+<section><title>Insert Point Before Selected Point</title>
+<para>
+Inserts a track point halfway between the previous track point and the current track point.
+All track point properties are interpolated between the two points.
+</para>
+</section>
+<section><title>Insert Point After Selected Point</title>
+<para>
+Inserts a track point halfway between the current track point and the next track point.
+All track point properties are interpolated between the two points.
+</para>
+</section>
+</section>
+
+<section><title>Delete Points</title>
+<section><title>Delete Selected Point</title>
+<para>
+Deletes the currently selected track point.
+</para>
+<note>
+<para>
+This is only enabled when a trackpoint is selected.
+</para>
+</note>
+</section>
+<section><title>Delete Points With the Same Position</title>
+<para>
+Deletes subsequent points that have the same position (but have different timestamps).
+</para>
+</section>
+<section><title>Delete Points With the Same Time</title>
+<para>
+Deletes subsequent points that have the same time stamp (but may have different positions).
+</para>
+<note>
+<para>
+This is not available on routes as they have no timestamps.
+</para>
+</note>
+</section>
+
+</section>
+
+<section><title>Transform</title>
+<para>
+These options alter the data of trackpoints of a track but not add or remove trackpoints.
+And don't seem to fit any other category :)
+</para>
+<section><title>Apply DEM data</title>
+<para>
+If any DEM data is loaded, this will apply the DEM data to give the track elevation data.
+Two ways of applying DEM data are offered:
+<orderedlist>
+<listitem><para>Keep. Retains the existing elevation data of trackpoints and only those missing an elevation value are set.</para></listitem>
+<listitem><para>Overwrite. Elevation data are set on all trackpoints even if they already elevation values.</para></listitem>
+</orderedlist>
+</para>
+</section>
+<section><title>Smooth Missing Elevation data</title>
+<para>
+In various locations across the world, there are missing DEM values (AKA DEM Holes) from the SRTM data.
+This is particularly noticeable in mountainous areas.
+Two ways of applying elevation data to trackpoints that do not have elevation values are offered:
+<orderedlist>
+<listitem><para>Interpolated. Missing elevation data is interpolated between the previous and next known values.</para></listitem>
+<listitem><para>Flat. Elevation data is filled in from the last previously known value.</para></listitem>
+</orderedlist>
+</para>
+</section>
+<section>
+<title>Convert to Track or Route</title>
+<para>
+If this is a Route then it will convert it to a Track.
+</para>
+<para>
+If this is Track then convert it to a Route.
+</para>
+<para>
+<note>
+Converting from a Track to a Route may involve a loss of information, in particular timestamp values (hence you are required to confirm this operation before it happens).
+</note>
+</para>
+</section>
+<section>
+<title>Anonymize Times</title>
+<para>
+Timestamp information of a track can be shifted to be all offset from 1901-01-01.
+</para>
+<para>
+Thus the timestamps themselves will no longer reveal exactly when a track was taken.
+However the relative difference between the timestamps is kept thus one is still able to calculate some properties such as speeds along the track.
+</para>
+<para>
+<note>
+This is not available for routes, as they have no timestamps.
+</note>
+</para>
+</section>
+</section>
+
+<section><title>Export Track as GPX</title>
+<para>
+Version1.1+: This allows exporting the track as a GPX file by opening a file save dialog.
+</para>
+</section>
+
+<section><title>Extend Track End</title>
+<para>
+Changes the current tool to add trackpoints to the end of the track.
+</para>
+</section>
+
+<section><title>Extend Using Route Finder</title>
+<para>
+Enables the Route Finder tool. Thus on a subsequent left click in the viewport, a route is calculated from the end of track to that point using the default route service and applied to the track.
+</para>
+</section>
+
+<section><title>Upload</title>
+
+<section><title>Upload to GPS</title>
+<para>
+Same as the layer <link linkend="gps_upload">Upload to GPS</link> command, but only applies to the track.
+</para>
+</section>
+
+<section><title>Upload to OSM</title>
+<para>
+Same as the layer <link linkend="osm_upload">Upload to OSM</link> command, but only applies to the track.
+</para>
+</section>
+
+</section>
+
+<section><title>Use With Filter</title>
+<para>
+This selects the track to be used in the <link linkend="filter_with_track">Filter With <emphasis>Trackname</emphasis></link> feature.
+</para>
+<note>
+<para>
+This is not available on routes.
+</para>
+</note>
+</section>
+
+<section><title>Edit Trackpoint</title>
+<para>
+This opens the Trackpoint edit dialog. See <xref linkend="Trackpoint_edit"/>.
+</para>
+<note>
+<para>
+This is only enabled when a trackpoint is selected.
+</para>
+</note>
+</section>
+
+<section><title>Refine Route...</title>
+<para>
+This function allows to request a Routing Engine in order to refine a given route.
+By "refining" we mean computing all real intermediates points between some given major points.
+This could be useful to compute a trip giving only the wished important steps.
+</para>
+<note>
+<para>
+This is only available on routes.
+</para>
+</note>
+</section>
+
+<section><title>View Google Directions</title>
+<para>
+This option is only available on a track created using the Route Finder tool.
+</para>
+<para>
+Launch a web browser to see the Google directions page which yielded the route.
+</para>
+<note>
+<para>
+The record of the Google route is stored in the track's comment, so if the comment is changed (or the route was created by something other than the Route Finder tool) this will not work correctly.
+</para>
+</note>
+</section>
+
+</section><!-- End Track Options -->
+
+<section><title>Waypoint Sublayer Options</title>
+<para>Repeats options available at the TrackWaypoint level, but only those for waypoints:</para>
+<itemizedlist>
+<listitem><para>New Waypoint. Same as the layer <link linkend="new_wp">New Waypoint</link></para></listitem>
+<listitem><para>View All Waypoints. Same as the layer <link linkend="wp_view_all">View All Waypoints</link></para></listitem>
+<listitem><para>Goto Waypoint. Same as the layer <link linkend="wp_goto">Goto Waypoint</link></para></listitem>
+<listitem><para>Delete All Waypoints. Same as the layer <link linkend="delete_all_waypoints">Delete All Waypoints</link></para></listitem>
+<listitem><para>Delete Waypoints from Selection. Same as the layer <link linkend="delete_selection_waypoints">Delete Waypoints from Selection</link></para></listitem>
+<listitem><para>List Waypoints. Opens a new dialog with the list. As described in the Aggregrate layer <xref linkend="waypoint_list"/></para></listitem>
+</itemizedlist>
+</section>
+
+<section><title>Waypoint Properties</title>
+
+<para>
+This shows a dialog with detailed information for the waypoint. Many properties of the waypoint can changed here, such as the comment, the symbol used in drawing or the image (normally a photograph taken at this position) assiocated with it. When a waypoint has an image, a thumbnail of it is drawn in the viewport for the waypoint (in preference to the symbol).
+</para>
+<para>
+If the waypoint has an associated image, then the Geotag information may be updated, either with updating the file's modification timestamp or not.
+This can be useful when the waypoint has been moved.
+</para>
+
+</section><!-- WP Prop END -->
+
+<section><title>Waypoint Operations</title>
+
+<section><title>Goto</title>
+<para>
+This centers the viewport on the selected waypoint.
+</para>
+</section>
+
+<section><title>Visit Webpage</title>
+<para>
+If the waypoint's comment (or description) starts with <literal>http:</literal> then this option is available and allows launching a web browser to go to the webpage.
+</para>
+</section>
+
+<section><title>Visit Geocache Webpage</title>
+<para>
+If the waypoint's name is in Geocache form (GCXXXXX) then this option is available and allows launching a web browser to go to the Geocache page.
+</para>
+</section>
+
+<section><title>New Waypoint</title>
+<para>
+Same as the layer <link linkend="new_wp">New Waypoint</link>.
+</para>
+</section>
+
+</section><!-- WP END -->
+
+<section id="geotagging" xreflabel="Geotagging"><title>Version1.3+: Geotag Images</title>
+<para>
+This dialog allows geotagging images (normally taken with a digital camera) via interpolation against a specific track or all tracks in the TrackWaypoint layer - depending on how it is invoked.
+</para>
+<para>
+Images need to have an EXIF DATE_TIME_ORIGINAL (nearly always set by a camera). This timestamp is then used to find the location when the image(s) was taken by searching through the track(s) to find the nearest time - interpolating between points if necessary to set the location.
+</para>
+<note>
+<para>
+Generally it is good policy to synchronize your camera's clock with your GPS clock before taking photographs. However the times can be adjusted afterwards (if necessary) to take into consideration clock differences.
+</para>
+</note>
+<para>
+Various options allow control of how the geotagging process is performed:
+</para>
+<itemizedlist>
+<listitem><para>Images - Add the images used for geotagging</para></listitem>
+<listitem><para>Create Waypoints</para></listitem>
+<listitem><para>Overwrite Existing Waypoints</para></listitem>
+<listitem><para>Write EXIF</para></listitem>
+<listitem><para>Overwrite Existing GPS Information</para></listitem>
+<listitem><para>Interpolate Between Track Segments</para></listitem>
+<listitem><para>Image Time Offset - The number of seconds to ADD to the photos time to make it match the GPS data. Calculate this with (GPS - Photo). Can be negative or positive. Useful to adjust times when a camera's timestamp was incorrect.</para></listitem>
+<listitem><para>Image Timezone - The timezone that the used when the images were created. For example, if a camera is set to AWST or +8:00 hours. Enter +8:00 here so that the correct adjustment to the images' time can be made. GPS data is always in UTC.</para></listitem>
+</itemizedlist>
+</section>
+
+</section><!-- TRW Layer END -->
+
+<section id="GPS" xreflabel="GPS"><title>GPS Layer</title>
+<para>
+The GPS layer is responsible for uploading and downloading GPS data
+from a GPS device. It also is responsible for realtime GPS tracking.
+Expand the GPS layer in the layers panel to see the two <xref linkend="TrackWaypoint"/> layers it
+uses for uploading and downloading. To upload, download, or use
+realtime tracking, right-click the GPS layer and click the appropiate
+menu item.
projects / andy / viking.git / blobdiff