A petition to save the all-weather lifeboat at New Quay in Ceredigion has gained support from more than ten thousand people.
In June, the RNLI announced it would replace the station's existing Mersey class all-weather vessel with a new 35-knot Atlantic 85 inshore lifeboat.
But seafarers, crew members and visitors say they are worried the change will leave a 70-mile gap on the coastline and no all-weather lifeboat in the whole of Ceredigion.
Campaigners are asking the RNLI to reverse their decision.
There's no question of our loyalty, all of us, to the RNLI - to its ideals, to its principles - but we're absolutely committed to the view that this decision is poorly-made, is a wrong one, and will put people's lives at risk. We don't know how the campaign will go, but we are in it for the long run There is no way that we're going to back down from this and we will use every legitimate channel to get the decision reviewed.
The RNLI said the decision was reached after an in-depth coastal review, which is carried out every five years and looks at the number of rescues, as well as trends in water use and the demand for search-and-rescue operations.
In Cardigan Bay, the last review in 2016 concluded that having 25-knot Shannon class all-weather lifeboats at Barmouth and Pwllheli will ensure the RNLI can continue a comprehensive lifesaving service without the need to station an all-weather at New Quay.
Since the petition was started, it has amassed more than 5,000 signatures online and another 5,000 on paper.
Ceredigion MP Ben Lake has also lent his support to the campaign.
To me, and everyone I talk to, it is glaringly obvious that there will be a gap in all-weather rescue capability for Ceredigion’s coastline after 2020. This is not satisfactory and I intend to do everything I can to overturn this decision. The RNLI Lifeboat Station at New Quay has delivered an excellent service for the past 153 years, and its crew needs to be given the correct equipment to continue their lifesaving work. This decision will not only affect New Quay but the whole of Cardigan Bay.
As part of the changes, Pwllheli and Barmouth lifeboat stations will also each be allocated a new all-weather lifeboat.
The charity also says New Quay's current lifeboat will not leave Ceredigion until the other two are in place, which is not likely to be before 2020.
See the report by our reporter Jess Main below: