The quality of the triangles and the compass is impeccable and the usability for navigation on nautical charts is really great, although the price level is a little daunting. The starter set was delivered relatively quickly. So the purchase met expectations.
The course triangle is not flat and is therefore not completely flat. As a result, reading and shifting commands are pre-programmed. Since we didn't try the set immediately after delivery (because we didn't need it yet and didn't even think of such a mistake), it's no longer possible to return it... So useless for us.
After 6 weeks, the black lines separate from the ruler. The eraser appears to contain solvents that attack the line (becomes opaque). It's no good. I would never buy it again.