VERSION 3 - MAJOR UPDATE - in the master code only

For OpenCPN v5. Uses svg icons.

Changes

Soundings are saved in point format lon-lat. This affects any soundings saved in the sqlite file, with version 2. To fix this, export the survey to a Hydromagic,xyz or csv
file. Delete the old survey and add a new survey. Import from the saved file into the new survey.

libspatialite-amalgamation cannot be recommended and has been replaced by mod_spatialite. This change was necessary to use the full range of spatialite functions.

The lon-lat point format for the geometry objects can now be used with these functions.

A tidal correction is still in the code but it is not satisfactory. Intention is to replace this with tidal corrections entered in a text file that can be read and used by
the plugin. This will allow separation between raw data and adjusted data.

Using OpenGL the soundings can be viewed without a sounding mark.
Now possible to delete a sounding using right-click.

Windows 
The plugin builds standalone without additional files.
Linux
Install packages 'libsqlite3','libsqlite3-dev', 'libsqlite3-mod-spatialite' before compiling.

Usage on Windows
Download the file 'mod_spatialite-4.3.0a-win-x86.7z' from http://www.gaia-gis.it/gaia-sins/windows-bin-x86/. Extract the files. Place all the files EXCEPT 'zlib1.dll' and 'sqlite3.exe' in the main OpenCPN program folder (The folder containing 'opencpn.exe'). Download sqlite3.dll and place in the same folder.

Usage on Linux (Tested on Ubuntu 16.04.03)
Install the packages 'libsqlite3','libsqlite3-mod-spatialite'.

License
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The plugin is licensed under the terms of GPL v2 or, at your will, later.
Some of icons used come from Pastel SVG icon set (http://codefisher.org/pastel-svg/), created by Michael Buckley is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported (http://creativecommons.org/licenses/by-sa/3.0/)