Hoolie, I had some initial difficulty too, but this program is quite good. I would first start with trying a "Routing" once you have had some success with that (and you will know), you can do a route
with multiple marks.
To do a "Routing"
1. First make sure you have selected a Polar for the boat: Go to Boat / Boat's Settings and look down until you see "Polar" and pick any boat polar in the dropdown menu.
2. Presumably you have signed in to qtVlm with your user and pass.
3. Get a current
Grib file of the area: Zoom out or in using + & - at top, pan by using arrows to get the area you want. Upper left - left mouse button down and draw a box to lower right, let go of left mouse button. The area should show as a shaded square. In menu go to fourth globe "Download from VLM" and download a grib. Save it to your grib area. Now you should have a grib file on the screen
3. Then Locate the Boat: Right click on water
and pick "Move boat here"
4. Then create a waypoint that you are going to go to: Right click in the water
, select "Place a new mark", in the popup window, under name and type of mark, pick "Mark" (optional), then Change to "Marque-1" to make it a unique name. Then under "Route" section pick "Sequence" number 1 (optional for Routings, used for Routes). Close the window. Then go to the main menu and pick "Routings" / Create a Routing. In the dialogue window under Finish and Start section, check "Routing for boat" then pick Marque-1 for finish. You can set other values, but that is enough. Pick OK.
5. The program should draw the isochrones and draw the optimal route
Hope this helps. Rick