New generation technology is being launched today to provide information on the earth’s sea levels. Consequently, these satellites (there will be two) incorporate new technology. Which will orbit the earth for the next 30 + years. We have been watching sea levels with amazing focus and detail for the last 30+ years. There is a handover schedule in place which will take a year and involve that the new readings are calibrated. With the known accurate readings being obtained from the current satellite. Once this has been done then the current will no longer be the lead satellite and will be phased out. It is important that we have readings on what sea levels are doing. As they can literally be a matter of life and death for some vulnerable communities living on the coasts of the seas.