Guinness Book of World record :

The record attempt has already been approved
as "the breaking of" the existing record.
Hereby I include the answer from GWR send to us :
Claim ID: 171226
Membership Number: 155339

Dear Mr Loncke,Thank you for your enquiry regarding your intention to
attempt the record for 'fastest ultralight circumnavigation'. Your proposal is
very similar to an existing record that we monitor and so we suggest you
attempt this instead : 'Fastest microlight circumnavigation'.

We have attached our specific guidelines for this category which details the requirements you must follow to make your attempt. You should ensure that all those participating and those witnessing the attempt are aware of the contents of these guidelines. We would also draw your attention to the specific authentication we require when you come to make your claim for this category. This is in addition to the general authentication requirements as detailed in the Record Breakers' Pack you already have.
Once the record has been attempted and you have compiled your claim and completed the Agreement Regarding Supporting Materials (included in the Record Breakers Pack), all the information should be sent to us here at :

GUINNESS WORLD RECORDS LIMITED
338 EUSTON ROAD
LONDON NW1 3BD
UNITED KINGDOM.