Some reasons that may motivate us to want to trim our maps are:
- Free up space for your GPS unit;
- You can increase space on your GPS unit by reducing the size of the maps to what you really need. So instead of using the Europe map (~4’5Gb) we can use the Spain map (~490Mb) which unequivocally occupies much less space.
- Reduce the time to calculate the route;
- The time to calculate routes is also reduced by having to include fewer roads in the calculations. Here too we would reduce the famous “recalculation”, as we forced a new route calculation by going through a different one than the one we had already drawed.