Demo: that's easily fixed. There's an option in-game to make sight work like SE4, and more options in settings.txt if you want to, say, see only planets but not the enemy ships.
I'll point out that knowing the locations of the planets has come from several thousand years of observation.
Still, a starship's basic sensors would probably be able to plot all a new system's planets pretty quickly.
EDIT: Santiago: 10"? Oy. I'm surprised you can even run SE5, since it requires 1024x768 resolution.