I am not sure you really need a Cait, just say your "In Transit".
I think a visa is needed to avoid problems.
A visa can be purchased on arrival in most large ports
in Indonesia for $25.00. it lasts 30 days.
I would get an Indonesian visa in Malaysia
before entering Indonesia.
The Indonesian's authorities will generally try and help,
Don't try bribes, you will end up in Jail.
Just smile and be friendly, don't be arrogant and be patient, nothing happens here very fast.
Tell them you are leaving as soon as possible and they might forget you are even there.
Don't expect good winds, most of the time it will be dead calm expect for squalls. We have not experiened any N/W winds during our whole trip, mainly N/E up north at this time of the year, and only in the afternoon. Further south , around Jakarta /Bali you might get some N/W winds, maybe. This is not the place for a sailing boat which is why we motor
, and most sail boats we have met motor
If you enter ports
stay away from the main harbour nobody will notice you for at least a couple of days (keep a low profile) and leave as soon as you can. Say you are "in Transit"
The Chinese shopkeepers speak some English
but they are not much help. We have developed many good Indonesian friends along the way, who speak English, let me know if you run into problems.