How to use navigation on long-distance hike

Hello, 

Got an Instinct Solar as a present and want to use it on a long-distance hike (200 km).

It doesn't have a map, and doesn't accept tracks with more than 50 waypoints. 

So how can I use this thing? As far as I can tell, the only useful thing I can do is bring a paper map and use the watch to bring up my coordinates? Or...? 

I used an etrex (?) ten years ago and it seems much more useful.