@rinigus, thank you for considering the UI issue, and for putting up with my ranting.
How do you select which engine to use? Which engines provide autosuggestions? This could be useful to display somewhere in settings (if it isn't already).
The reason it took me so long to work this out (I was tapping on the map instead) is that the top panel doesn't look like a traditional tappable SailfishOS UI element. Additionally, once I've done it once (which I did by accident, trying to swipe instead), the "tap to begin navigating" message doesn't appear and there are no longer any visual clues as to what you need to do.

My other point (which I might not have made clear) was that if I enter, for example, "1234 north main st <city>", I get a list of results, which look like:

• North Main Street, <city>, <country> 1.9 mi south-east
• North Main Street, <city>, <country> 3.7 mi south
• North Main Street, <city>, <country> 2.4 mi north-east
• North Main Street, <city>, <country> 4.6 mi north-east
• North Main Street, <city>, <country> 1.9 mi east

Since the list doesn't include the street number, I have to guess at which is the right one based on the direction (and guess the distance too - maybe I know it's north-east, but not how far?) A button to show these results on the map would also go a long way toward removing this ambiguity.