Garmin is way too slow with their system for chart updates. Dutch, like Westerschelde, waters are covered by using sources of over 5 years old. That’s not just bad customer service, nor in line with the high price you have to pay, it’s dangerous. Navionics (Garmin owned) is slightly better organized with chart updates. But also is years behind with the charts in this area. I’ve been a professional mariner all my life. Actually hardly use this Garmin chart as there are many much better options, some are for free.