You can make a reservation here, even if you like. You will then know in advance whether you can sail along.
If you do not make a reservation, you can also buy a ticket on the boat. When reservation is not possible try it on board maybe there are some tickets to buy.

Choose date for reservation in the calendar on this page or the home page (change month, click on the yellow ball on the left) and then choose sailing schedule. (Right next to calendar)
Enter number of people. Enter the number of bicycles and choose your route(s), a route is e.g. Amersfoort to Soest and Soest to Baarn. You can also book Amersfoort-Soest and board again later in the day in e.g. Spakenburg. Then click out intermediate routes.
Each route indicates the available places, if the number of available places is 0 then you can
you can no longer reserve anyone on that route. Take a good look at which routes you are booking.

Enter the number of free tickets and your e-mail address.
Select order, your order will appear. Check whether your order is in order.
Select change if the order needs to be changed.
Click on: I agree to the terms and conditions. (If you do not do this, payment cannot be made and the reservation will expire after 10 minutes)
Continue to iDEAL payment with next step.
After payment you will automatically receive your ticket in your e-mail.
There is a code on the ticket, take this code with you to the bicycle boat, that is your ticket.

ATTENTION: Bad weather or bad weather forecasts are no reason to cancel a reservation