The Coast Guard saved more than 400 people in operations this year.
The organisation has published its end of year statement, in which it says over 1,100 missions were carried out by volunteer units.
It says it saved 340 people back in 2017.
The Coast Guard's three rescue Coordination Centres - at Malin Head, Valentia Island and Dublin - managed a total of 2,650 incidents.
While its helicopters conducted eight long-range offshore medical evacuations.
A Helicopter Emergency Medical Service (HEMS) was also provdied to the HSE/National Ambulance Service - including inter-hospital transfers.
The busiest inter-hospital transfer routes are from Letterkenny and Sligo to University Hospital Galway.
By the end of the year, Coast Guard helicopters will have flown more than 670 missions, of which 119 were conducted on behalf of the HSE.
File photo
Services also included inland searches for missing persons and medical evacuations in support of An Garda Síochána and Mountain Rescue Teams.
MRCC Dublin also processed a total of 137 electronic transmissions - the majority of which proved to be false, arising from accidental activation or out of date equipment no longer in service.
The Coast Guard says this should not detract from their value, and highlights the importance for all users being familiar with their operation.
Coast Guard director Chris Reynolds said: "I want to particularly acknowledge the commitment and professionalism of our volunteer members.
"In addition to the three core services that they provide they are an integral part of community resilience and continually act as the eyes and ears of our RCCs in assessing and responding to any coastal emergency."
He also reiterated a core message of raising the alarm in time: "If you can raise the alarm and you can stay afloat then you have an outstanding chance of being rescued by our world class rescue service.
"If you see somebody in trouble or if you think they are in trouble at sea, on the water or along the coast Dial 112 and ask for the Coast Guard".
The nationwide network of volunteer Coast Guard units has a membership of around 1,000.
