A basking shark satellite tag is still missing off the north coast of the Island.
The Manx Basking Shark Watch attached the device, worth £2000, on Wednesday, but if has since come off.
The charity has upped the reward fund for finding the tag to £200.
It is still floating 7-10 kilometres off-shore.
It is a similar shape to an ice-cream cone and has a red top about the size of a tennis ball.
DoI apologises for motorsport fees error
The chairman of Manx Auto Sport says the club accepts an error was made
Tynwald rejects issuing censure
Members debated the issue for over two hours
Reports of dangerous jet ski activity prompts warning to 'respect Safe Bathing Areas'
'We ask all watercraft users to act responsibly'
Former Manx Care CEO to take charge of Guernsey health service
Teresa Cope left the Island's healthcare provider last month
