The HUD Data Displays

These are accessed from the "Miscellaneous" tab in the "Onboard Devices" menu. Each of these options will display a small screen on your HUD with the selected data. The three different data displays available are "Local Target Data", "Remote Target Data", and "External Environment Data".

The Stardrifter's Weapon Systems

Yes, the Stardrifter does have weapons. When the Felisians created the Stardrifters, they armed them in case they should encounter hostile alien life. Thus all Stardrifters carry fationic cannon, which are powerful enough to destroy whole planets... However, Felisians are a peaceful, non-destructive race, so no feature has been included in Noctis that allows you to use your cannon.