GPSActionReplay

Setting Marks is the first step to get a Regatta replay

This consists in setting directly on screen where are all the race marks

To do so, you can either use WayPoints if someone on the water recorded the place of each mark (load it from GPX file). This is the most compliant way since you know directly where to put the marks (over the waypoints), and moreover, when adjusting the marks, the waypoints of the screen will behave as "magnet", so that you put exactly the mark at the right place.

But in main cases, you won't have the marks as waypoint. Never mind, you'll find the exact right place thnaks to the tracks : load the tracks, play with time cursor, and, using the tracks shape, you'll find each mark on the screen. It's what we're showing below.

Besides these explanations, you can find a tutorial video here (right-click to save the file as...) :


Several kinds of marks exist, depending on your needs :

  • Door mark : to create a line to cross. For instance for start and finish line, but can be used for any other purpose (ski racing, etc.)
  • Upwind and Downwind buoys : these marks depend on wind. An upwind buoy has to be tacked, and a downwind buoy has to be jibed. This is important for the regatta replay and analysis (namely for time to lag)
  • Starboard and Port marks : to be passed on the right side, depending on the wind direction
  • Proximity point : a point which has to be approached at least to a given radius (settable). Maybe usefull when you're not quite sure about a mark position...

Let's start.

At first, we put the time near the start, when people have just crossed the start line. We choose "Door Mark", and then drag the mouse to create the start line. It's our "mark 1"





Now, the first buoy is upwind. Whe choose the relevant "upwind buoy" mode, and click its position on the screen to create it ("mark 2").





And so one with now a downwind buoy ("mark 3")





Mark 4 will be a new upwind buoy





The next mark to pass already exist, since it's the downwind mark ("mark3"). No use to create a new one again. We will use the "mark 3" again when defining the path...

So, the next and last new mark to create is the finish line :





Here it is. Let's have an overview of the whole marks, zooming-out the scene :






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