Klein Vaarbewijs 1 (small craft licence 1) · Chapter 9
Reading the chart, understanding NAP and the water levels, reading the water level gauge (peilschaal) and the height scale (hoogteschaal), and working out clearance (doorvaarthoogte) and depth.
6 lessons36 questions
On the water you want to know how far it is, whether you fit under a bridge and whether there is enough water under your boat. A chart (waterkaart) gives distances, clearances (doorvaarthoogtes) and depths. Those clearances apply at a fixed level, and the water now is sometimes higher and sometimes lower. That is why you also read the scales along the water: the water level gauge (peilschaal) gives the water level, the height scale (hoogteschaal) at a bridge the clearance now.
In lesson 1 you learn to read the chart: the scale, measuring distances, the legend, and where else to find information for your trip. After that come NAP and the water levels, the water level gauge, the height scale, and two lessons with sums: the clearance and the depth now.
With KVB1 complete you open every lesson and test.
Continue with lesson 1 · €10The scale of a chart and measuring distances, the legend, what the chart says about a bridge and the depth, the almanac, the water atlas and other information for your trip, and what must be on board.
NAP as one zero point, writing above and below NAP, canal level (kanaalpeil), weir level (stuwpeil), summer and winter level, and the current water level: why it differs and where you find it.
What an NAP gauge (NAP-peilschaal) shows, the stripes, the numbers and the M, reading just below and just above a whole metre, and converting a water height from Waterinfo to metres.
What a height scale (hoogteschaal) at a bridge shows and where it stands, reading blocks and decimetres, what happens when the water falls or rises, the height sign and C.2, and why you keep room to spare.
From the chart value to the clearance (doorvaarthoogte) now: the sum in four steps with a sketch, plus and minus relative to NAP, getting the units the same, whether your boat fits with or without its mast, and when you need no sum.
Working out the depth now with the sign the other way round from the clearance, draught (diepgang) and under keel clearance (kielspeling), the depth on C.1 and the depth board, and why a depth on a sign is not the draught you may have.
14 questions from all 6 lessons. You answer everything first and then see your result, with an explanation for each question.