See the general rules quote:
The UDF should be self-contained (except for any I/O mentioned in the challenge). In particular, you may not do things like fetching extra data from a remote site.
Now, if you come up with a way tou output a file that then can be displayed by a standard Windows application, then yes, you can write to a file. however, the question is how you generate the BMP file as KiXtart cannot write binary files (which a BMP file is) and you are not allowed to use other code. See the general rules quote:
The UDF may only use the KiXtart/KiXforms commands/functions/macros, no other code fragments are allowed. COM-calls that are part part of a standard default Windows installation are allowed.
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There are two types of vessels, submarines and targets.
