I guess it would be appropriate to refer to the KiXtart Manual:
Quote:
Variable types 
In KiXtart, variables are always of one fundamental data type: Variant. The current implementation of KiXtart uses three types of variants: long integers, doubles (8-byte floating point numbers) and strings. A variant of type string can contain up to 32,000 characters. Integer variables can contain any value between -2,147,483,648 and 2,147,483,647. The type of a variable is automatically changed to the result of the expression that is assigned to it. This means that if you assign a string to a variable containing an integer, the type of the variable is changed to a string.
I don't think you'd see an Integer, the number might just be available due to the API Ruud is using to get the variable type. 
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There are two types of vessels, submarines and targets.