AvNav implementation in OP2

[BlackSea]

AvNav 20201105 Released
ChangeLog
-Feature: Power saving button (android and BonjourBrowser) #69
-Feature: Implement course vectors (depending on speed) for boat and AIS #59, see Navigation Page (some new Settings)
-Feature: Allow to set AIS symbol size and Border #58
-Feature: Allow to set Images for different AIS targets, own boat, marker #53, see Description
-Feature: Show overflow button if more then 8 Buttons on a page, allow for 2 button columns #68, see Navigation Page
-Feature: Setting to force back button on top
-Feature: Remove package dependency to gpsd
-Feature: Allow plugins (widgets) to have event handlers at their objects and to communicate with the python part #75, see Plugin Description and User Java Script
-Feature: Usage of SignalK charts #76, see SignalK Charts
-Bug: Avoid n2k not working any more after long time
-Bug: Unexpected go back from various pages when clicking (itemlist clicking)
-Bug: Correctly go to previous waypoint when deleting last in route
-Bug: Become robust against empty values in DPT,DBT #60
-Bug: Correctly handle filters in avnav_server.xml with blacklist only
-Bug: Become more robust against shortened AIS type 5 message ( no callsign, name,... for some AIS targets)
-Bug: Reload a chart in the Browser if it has been modified on server (mbtiles, ocharts)
-Bug: (Android only) accept unknown NMEA talker ids
-Bug: Make center to Ais target working again #74
-Bug: Correctly show anchor watch distance in m #62
-Bug: Fix broken user app dialog for long urls #66
-Bug: Change handling for mbtiles scheme #63, see Description Charts

Also AvNav-OCharts-Provider 20201105
Changelog
-Improved memory handling. The Xvfb will be restarted if it reaches 120MB
-Faster start up. The chart information will be kept in a cache file. So reading the charts is only necessary if some charts have changed.
-Removed memory leak within the used OpenCPN plugin (workaround) - so the memory usage of Xvfb will not increase that much any more.

Those who already had AvNav installed can use

Code:

sudo apt update && sudo apt upgrade

Who has not yet, can install AvNav stack with openplotter-avnav
https://forum.openmarine.net/showthread....0#pid14280