In the options, the Locator Feedback Gauge and the Marker Feedback Gauge both have 6 settings each, yet the descriptions for these settings only mention 4 or 5 settings.
There are 2 Subtitle settings. One is present in the Sounds settings, and the other is present in the Language settings. Don't know if you only need to enable one of them in order to have subtitles or if both need to be. Actually, upon review the 2 settings might serve different purposes.