Maemo Mapper has a few displays in addition to the primary map information. It can overlay the map itself with routes, tracks, and points of information, and show the current speed as well as way-point directions over the map. It also has a secondary display of GPS position information, including altitude and compass.

However, it's missing a couple of critical displays; the distance to the next way-point as well as to the end of the route, and an estimated arrival time to the end of the route. The first two are simple to provide, and in fact are available through the menus, just not as a constantly displayed overlay. The third one can be tricky; the travel time may not be included in the route information, or it may be inaccurate. Estimating it from average speed is the other alternative, also vulnerable to errors when travel conditions change. However, providing some kind of estimate is still a useful service to the user.

The readability of the overlaid information is not quite ideal in the challenging in-car circumstances. The blue dot signifying current position is small on the high-resolution display, and difficult to see in sunlight. Making larger and animated (I would suggest a rotating symbol of some sort; keep in mind also the suggestion about scaling its size according to position accuracy estimate) would help. The speed indicator flickers; whether this is due to lack of double buffering or otherwise, it's distracting. Finally, the route direction dialog also changes shape about once per second, sometimes laying out the direction on one line, sometimes needing to place the last word on the next. Not surprisingly, this draws too much attention to it (hopefully not from the driver!) as well as requiring extra effort to read.