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About the application:

qtVlm is a navigation tool designed for sailing boats. It is also a gratis weather grib viewer that accepts all kinds of gribs. It can read and display maps in different formats, such as Vector charts (S57), Raster Charts (kaps, geotiff, etc) and mbtiles charts. It contains an AIS module and an Instruments Module, that can retrieve data from different NMEA sources, or from internal GPS. It can also send performance data (VMG, target speed, etc) to a navigation system. qVlm is able to calculate the best course using Routes and Weather Routings modules. A lot of options are accessible, like multi-routing to search the best departure date-time according to different parameters, routing on a pathway, or taking in acc segments with engine for instance. qtVlm can acquire position and NMEA info via different sources (internal GPS, tcp, udp or gpsd), and can display a lot of navigation instruments and performance data. A Begin Line mode can be activated, which will calculate times and distances to line and present a secure place, and also manages a chronometer. qtVlm can also be used In Simulation Mode. In this mode qtVlm will use wind and currents data from grib to simulate navigation. All instruments will be usable, and true live AIS targets are received from Internet. Beware not to collide with a true fishing boat or other qtVlm boat. There is also a pure Virtual Racing Mode based on VLM online races. Vector charts (S57) and Geo-referenced marine maps (kap, geotiff, etc.), and mbtiles charts can be installed. qtVlm can also display maps from different Tiles Servers. Several grib files can be loaded at the same time, in order to be able to route using different parameters (winds, currents and waves for instance). Weather faxes photos can also be loaded on top of gribs. Route and Weather Routing modules, navigation instruments, S57, mbtiles and Raster modules, AIS module, Iridium module, Begin Line mode and Good Circle gribs management are accessible only with the full ver, through in-app purchase.