Thanks for your reply. The electronics I've added most recently was the small computer on which I loaded SignalK and InfluxDB. This transformed our electronics from realtime-only to also providing historical data, and allowing the use of the same display software on all our devices.
Regarding improving safety:
1. Uniform display of realtime data across iPhone, iPad and Mac is a safety plus, especially when tired/stressed.
2. Display of environmental data (atmospheric pressure & temperatures) along with the usual boat performance data is a safety plus.
3. Availability of trends (from recordings) is a safety plus.
4. The ability to easily select between redundant data sources fed to all displays is a safety plus.
5. Hardware redundancy is a safety plus.
By the way, our only hardware chartplotter is an old, very small Garmin. We expect to dispose of it soon since software chart plotters which we can run on all our devices offer more features and (on iPhone and iPad) are portable. We carry multiple iPhones and iPads and they're far less susceptible to lightning damage unless connected for charging. That's another safety plus.
At the end of my blog I say we feel ready AGAIN. Just as when in the past we've headed off into the wild blue Zen Again again has a fully capable, modern electronics system. We don't have a lot of expensive kit, but we have all the information and it's well presented. For small boats and/or those with limited budgets I believe my approach has merit.
By the way, my first question in this thread was whether a link to blog posts like mine were welcome on the OCC Facebook page which seems much more popular than this Forum.