Many SBF candidates fail not because they didn’t study, but because of avoidable, specific mistakes. Here are the most common ones, with concrete solutions.
Mistake 1: Learning light signals and sound signals superficially
This is the most common failure point in the theory exam. Light and sound signals have many variations that look similar but have different meanings.
Light signals – what you need to know:
- Red sidelight = port (left side)
- Green sidelight = starboard (right side)
- White stern light = rear
- White masthead light = vessel under engine power
When you see green light on an approaching vessel, you’re on their starboard side – you must give way. When you see red light, they must give way to you.
Sound signals – what you need to know:
- One short blast (·): “I am altering my course to starboard”
- Two short blasts (··): “I am altering my course to port”
- Three short blasts (···): “My engines are going astern”
- Five short blasts (·····): Warning signal – danger
Solution: Don’t memorize these as lists – understand the logic. The Boatpass app automatically shows your weakest categories more often. Aim for under 20% error rate on light signals before your exam.
Mistake 2: Memorizing answers instead of understanding rules
Exam questions can be phrased differently than practice questions. Candidates who only memorize trip over variants. This is especially common with right-of-way rules:
- A sailboat under engine power is treated as a motor vessel – it does NOT have right of way over other motor vessels
- Commercial shipping has priority on German federal waterways
- Special rules apply in narrow channels
Solution: For every question you get wrong, read the explanation – not just the correct answer. The Boatpass app provides explanations for every question.
Mistake 3: Neglecting knots – the #1 failure in the practical exam
Knots are the number one failure point in the practical SBF exam. Candidates practice them once or twice and assume they’re fine – then under exam pressure, with nervous hands, things fall apart.
Required knots include:
- Bowline (Palstek) – creates a fixed loop, essential for mooring
- Cleat hitch (Webleinstek) – attaches a line to a cleat or bollard
- Figure-eight (Achtknoten) – stopper knot
- Square knot (Kreuzknoten) – joins two lines
Solution: Practice knots daily. Five minutes with a short piece of rope is enough. Practice until you can tie them without thinking. Put a rope on your desk next to your keyboard.
Mistake 4: Skipping full exam simulations
Studying questions individually doesn’t prepare you for the actual exam experience: 30 questions, 45 minutes, no feedback until the end.
The actual exam has three parts:
- Theory exam – written multiple choice, 30 questions, 45 minutes
- Knot exam – demonstrate required knots correctly and quickly
- Practical exam – maneuvers on the water: docking, undocking, man-overboard drill
Solution: Complete at least three full mock exams before your real one. Use exam mode in the app – it replicates the real conditions exactly.
Mistake 5: Registering too late
DMYV exam slots fill up weeks in advance – especially March through June before boating season. Candidates who wait until they feel “ready” often can’t find a slot for 8 weeks.
Solution:
- Check the DMYV exam committee website for your region
- Register 4–6 weeks before your planned study completion
- Note: depending on the examination board, fees must usually arrive one to two weeks before the exam
The official exam fee for SBF Inland is approximately €131 (as of 05/2026).
Mistake 6: Misunderstanding license requirements
Many believe small boats don’t need a license. True – but only up to 11.03 kW (15 HP) for combustion engines or 7.5 kW for electric motors. Driving a more powerful boat without a license risks fines and insurance problems.
The minimum age to independently operate a motorboat on German inland waterways is 16 years.
Summary
Most failures come from avoidable, specific gaps: superficial knowledge of light and sound signals, lack of exam simulation practice, and underestimating knots. Knowing these failure points puts you significantly ahead.