Although many of the CO alarms are supposed to be good for 7 to 10 years, the reality in salt air, is that they are probably good for less time than that. See below: It might be interesting to compare one of the units on our boats with a standard gas measurement meter or the Aero Medix unit, and see what the reliability/reading really is yearly.
I need to emphasize that any of the monitors will be adversely affected by high heat, humidity and salt water. These will all shorten the life of a monitor.
The $200 Aero Medix CO monitor is only good for 5 years! Less in high temp, humidity or salt! I would consider replacing the C O monitor at least every 5 years on the boat. It should be removed from the boat, just as your PLB or electronics are, when you leave the boat in storage. We have a bag that all of these things go in, and are taken into the climate controlled home.
I need to emphasize that any of the monitors will be adversely affected by high heat, humidity and salt water. These will all shorten the life of a monitor.
The $200 Aero Medix CO monitor is only good for 5 years! Less in high temp, humidity or salt! I would consider replacing the C O monitor at least every 5 years on the boat. It should be removed from the boat, just as your PLB or electronics are, when you leave the boat in storage. We have a bag that all of these things go in, and are taken into the climate controlled home.