How do you pack for a 2 week vacation for 4 people in the prius hatch?

We have the Prius Nav in our 2010 Prius and hated it until we bacame accustomed with the operation. Now I prefer the Prius Nav to Garmin.

 

What Prius Nav to you have? The Nav in my Prius Tree doesn't show altitude or speed limit. You can't program multiple points to define a route, the display is impossible to read if the sun shines on it and the upcoming street names are difficult (for me impossible without glass) to read if you are not on an a-to-b route and just want to know which streets you are approaching. There are no Points-of-interest unless you pay for a smartphone of which many models won't work with Entune. I understand map updates are very expensive and difficult to install. My Garmin doesn't have any of these problems.