I live on a boat, should I choose the HS1 or FRx and why?

It is important that the AED remains within its temperature range, otherwise it may malfunction. You want to prevent this, because you want to be able to rely on your AED when the time comes. Fortunately, Philips AEDs perform daily self-tests, including a temperature test. The chance of a malfunction with an HS1 is greater when it is placed in a boat or vehicle, because the temperature often drops below 10 degrees C in the evening. That is why we recommend the FRx, but we still advise you to bring the AED indoors at extreme temperatures. Given your unique situation with a home on a powerboat, an HS1 might suffice if temperatures stay between 50 and 43 degrees year-round. However, if it drops below 10 degrees C on cold winter days without heating, then the FRx would be a better option. You are of course the most familiar with the climate conditions on board, so I trust that you will make the best choice based on your experiences.