The Export Data Window

Maps produced by ReefMaster are not suitable for navigation, and should never be used for navigation.




* It is not possible to save data using the Export Data window when using the trial version of ReefMaster.


After assets have been selected for export, the Export GPS Assets window is shown which displays a list of the assets selected for export along with a range of export options.


1. Asset List

All of the assets that have been selected for export are displayed in a scrollable list. The type of the asset can be determined from the icon shown in the asset row. Individual assets can be deselected if not required for the export, by clicking the check-box at the far left of the row.


2. Export Options

Global options that apply, regardless of the destination file format.


Use Original Waypoint Symbols

When exporting waypoints, use the waypoint symbol that was associated with the waypoint at the time of import, if any. This option is useful if the original waypoint symbol does not have an equivalent in ReefMaster and the symbol needs to be preserved on the original device. This option only works if the chosen export format matches the original import format of the waypoints.


Tide Adjust Track Point Depths

Apply tide adjustment to track point depths. This option only has an effect on track for which a tide offset has been defined.


Saving the file(s)

When the required options have been set, the file(s) can be exported using the Save button (5).


Export Formats

The required GPS file format can be selected from the displayed list (3). When a file format is selected, further options specific to the chosen format are displayed in panel (4).


CSV Format

Comma Separated Value or CSV files are text files that contain values on each row, separated by commas. CSV files are easy to import into a range of further applications, such as Microsoft™ Excel.


ReefMaster can export Tracks, User Maps and Waypoints as a single CSV file, with the format latitude, longitude, depth.


·Depth is written in metric or English units, depending on the global units setting.

·When writing in metric, depths are expressed in metres.

·When writing in English units, depths are expressed as feet with a fractional component.

·All track and path points from the selected assets are written into a single CSV file.


Additionally, tracks contain the hardness layers E1, E2 and PeakSV following the depth value. Where are hardness value is not present for a particular layer, the value -1 is written.


GPX Format

Export selected assets in GPX format. GPX stands for GPs eXchange format, and is a common, text (XML) based format that can be read by many different applications, as well as some GPS devices.



Exporting assets in GPX format results in a single file, with the extension .gpx.

Map contours are exported as segmented tracks; a single track with multiple separate segments for each contour line.

GPX format is a good choice when exporting data for use in other software applications, or when exporting data for use in a GPS device that is not natively supported by ReefMaster. In this case, another software package may be available that can convert GPX files into the format required for import into that GPS device.


Target Humminbird™, Target Garmin™, ReefMaster

The standard GPX file format does not contain depth information for track points. However, the file format can be extended such that it does. Both Humminbird™ and Garmin™ use a modified GPX file format that includes depth information. If targeting applications by these manufacturers, or other applications that can read this depth information, select the appropriate option here. The ReefMaster option produces a standard GPX file with no depth information in the track logs.



Export selected assets in Humminbird™ native file formats. ReefMaster does not generate native map files for Humminbird devices; instead, contour lines are exported as segmented tracks, which can then be configured on the GPS device to display as solid lines in a range of colours and widths. See Configuring Maps for Display on Humminbird Devices for instructions on how to do this.


·Map contours and tracks are exported as tracks to files with naming format 00.HT, one per track or map. ReefMaster uses some undocumented Humminbird™ file format features to add multiple, separate contour lines to a single track.

·Waypoints are exported to the single file DATA.HWR.

·Hardness area outlines are exported as a separate, segmented track file. The name of the hardness track is postfixed 'H' when viewed in the Humminbird unit.


All Humminbird files must be placed in a folder titled ‘MATRIX’, located at the root of a memory card, for import into a Humminbird™ GPS device. Note that any data already present in the folder selected for export may be overwritten.



(1) Unicode track and waypoint names

Select this option to write track and waypoint names in Unicode, which is a two-bytes-per-character character set required for Asian languages. Use this option when targeting Japanese or Korean Humminbird devices. This option should not be used when targeting English language Humminbird Devices.


Map splitting options

A single contour map can be split into multiple separate tracks, each of which can then be styled to display differently on the Humminbird™ GPS unit; for example, shorelines can be shown in a different colour or link thickness than contour lines.


(2) Track for shorelines

Create a separate track for shorelines and islands. The generated shoreline track file name is appended with "SL".


(3) Colour cycle contours

Export every third depth level into a separate track, so that a total of three contour tracks are generated. The three generated tracks can be assigned different colours in the Humminbird™ unit, which allows the direction of the depth change to be discerned. The generated colour-cycled contour track files are appended with the suffixes "C1", "C2" and "C3".


(4) Track for minor contours

Export minor contours as a separate track. The generated minor contour track file name is appended with the suffix "M".


Note that all of the above options may be combined, and are applied in the order; shorelines, minor contours, colour cycle. For example, selecting all three options will yield a total of five tracks; shorelines, minor contours, and all remaining contours cycled over three tracks.


The maximum number of track-points allowed in a Humminbird track file is approximately 21,000. If a contour file exceeds that count, then further HT files are created as required, with an increasing number appended.


LCM (Lowrance™)

ReefMaster exports maps in two formats that can be read by Navico units, such as Lowrance and Simrad GPS units; AT5 and LCM.


LCM Maps

LCM files are Lowrance native contour map files that can be displayed on most Lowrance chart-plotters. LCM maps have a limited range of styles, and are only capable of displaying line objects such as shorelines and contours. LCM format maps also have some compatibility issues with the most recent Navico units; in most cases, AT5 is the preferred map format for Navico devices (see above).


Individual LCM files cover a set geographic range; ReefMaster generates as many LCM files as required, with increasing numeric file name suffixes, to contain the selected user map(s). All of the LCM files generated after exporting a user map should be copied to the target device.



To write maps in LCM format, select the LCM button.


(1) Waypoints as GPX, Waypoints as USR

Waypoints cannot be written to LCM files, so must be written either to a GPX file or to a Lowrance native USR file.


Waypoints and can be exported in a GPX file for import into HDS series Lowrance™ devices, or they can be exported in a USR Lowrance™ native file format for import into HDS or earlier devices. Note also that the full range of HDS waypoint symbols is not available in USR format.


Nameless Waypoints as Icons

Lowrance has the concept of icons, which are waypoints that carry minimal information - just location, and symbol, but no name. When an icon is imported from a Lowrance native file, it is stored in ReefMaster as a waypoint with no name. When writing waypoints to a Lowrance USR file, waypoints with no name can be written as icons or waypoints; choose which using this check-box. If waypoints without a name are written as waypoints, they are given a name of the form icon{n}.


(2) Target post v4.1 HDS

Lowrance HDS units with firmware versions above 4.1 use a different method for calculating metric values on LCM maps. Check this option if exporting to a device that meets these criteria.


AT5 (Lowrance™)

AT5 Maps

The AT5 map format is a Navico™ map format supported by a wide range of Lowrance™ and Simrad™ GPS devices, from the older LMS range right through to the most recent HDS touch. The AT5 format is able to combine vector layers, such as contour lines and isobaths, with raster (image) layers. See Exporting Navico AT5 Maps.


Google Earth™

See Exporting Maps for Google Earth.



User maps and map projects can be exported as ESRI Shapefiles, which is a widely supported vector file format.

Shapefiles produced by ReefMaster are suitable for use in further GIS applications, and for use by the Insight Map Creator for generating AT5 maps for display on Navico devices. Shapefiles may also be useful when generating maps for display on Garmin devices using tools such as cgpsmapper.


All shapefile exports use the WGS84 datum and are exported with associated projection (.prj) files.


Shapefile export files

The following files are generated when exporting in shapefile format. All of the filenames detailed below are prefixed with the chosen filename on export. Note that, depending on the contents of the map being exported, not all of the following files may be generated:


·Isobaths.shp                              Isobaths as polygons.

·Major contours.shp                    Major contours as lines.

·Minor contous.shp                    Minor contours as lines.

·          Shorelines.shp                    Water bodies as polygons.

·Islands.shp                              Islands as polygons

·InvertedShorelines.shp          The bounding box of the exported map, with shorelines as holes within this box. Note that depending on the shape of the shorelines, the surrounding polygon may be rendered as a polygon without holes. Enclosed areas within the exported polygon(s) are land areas.

·Hardness.shp                              Hardness areas as polygons.

·ShorelinePolylines.shp          All shoreline and island boundaries, as a set of lines.

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