Hi Broady, I assume you are planning to go 2021.
April/May is usually the time Darwin Boats head for the East Kimberley area for a few weeks at a time. The King George and Berkeley Rivers are a must see and you will find other boats there that time of year. It’s also the end of the “run-off” and end of cyclone season and trailer boats from Wyndham head up there after barra.
The Bonaparte Gulf can get very rough, particularly when you have to head back to Wyndham in south easterlies. Probably the best advice you will get, is don’t set deadlines to be somewhere on a certain date. Pick weather windows that are safe to sail in the Bonaparte Gulf, and if that means you have to sit and wait for a week, that is what you should do. You need to get accurate weather forecasts. Probably via your sat phone will be the only option.
It’s a long trip in a small boat and you are likely to be sailing by yourself for most of the trip until you get to the destinations like the KGR and Berkeley.
If your boat and its crew are well prepared and you have plenty of fuel, you will find it’s a fantastic place and you’ll love the trip.
Have fun, Ross