Sounds like some nautical adventure!

When is it appropriate to bring in data through flags vs through using 
ports.
At the moment I'm thinking:

Flags: 
* When needed immediately on initialisation
* When it won't change

Ports:
* Dynamic data
* Data not available at the start

Is another reason to use a flag to avoid a perhaps unnecessary maybe? This 
came up when trying to have a time variable. I don't want a maybe time 
variable as then I have to handle the maybe every time I use it. So I'm 
thinking to pass the time in as a flag to begin with then keep it update 
through ports.

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