Is it possible to use this functionality within say MS Excel to calculate a large number of distances between two ports. e.g. a list of 100 ports and the distance between each one?
I suggest that you should contact Thomson Reuters Support Desk directly about this, as this is not an API question.
You can find the contact details by logging in to http://my.thomsonreuters.com, selecting Contact Us and then Product Support or from your Thomson Reuters Eikon.