Gianko: yes, I have that too. Even though I didn't make it so that the icon would indicate whether sonud is off or not (speaker_toggle or how it is named does not work).

I actually tried it outside yesterday and as soon as it locked GPS position, it started to speak. Apparently, it does not speak when GPS is not locked.

Only I have the phone set to Czech interface and wanted navit so speak English - the result is it reads Czech instructions with english accent, which is barely understandable. I have to found out how to make it speak english proper.