I've used the free Android version for keeping a tracklog of walks I've taken. I haven't tried it in a vehicle. Most of the menu items are intuitive. The only problem I had was finding the icon to save a PlaceMark. It's the STAR.
There is tool available to track your current route, even in GPX format. This will set the place marks automatically, you can set it how often. I just never tried it, so I cannot tell whether it works well or not :-)
navigator automatically wrote a tracklog of waypoints into a nmea file in its nmea folder. The waypoints were recorded too frequently for easy use with the other software I have for measuring. I must have had the wrong settings on my tablet.
Does navigator have settings to control how often placemarks are saved? Am I getting too many because it expects me to move faster (in a vehicle vs walking)?
While it was tracking, I used the STAR icon to set placemarks at selected locations.
I use my other software to give me the speed that I was walking between any two waypoints and the distance along the tracklog that I had walked.