Originally Posted by Adelie
A Faraday cage is no guarantee against lightning
, it just improves the odds.
It does nothing at all for coronal mass ejections and disputes with folks that have anti-satellite weapons and then there are all the myriad ways that the electrical system
can go down. And the spare batteries get drowned.
Individually these are very low probability events
. Together they are just low probability.
I agree lightning is certainly the biggest concern when relying on electronic mapping.
If you get a severe lightning strike all bets are off. Thruhulls evaporate, holes get blown in the hull
, the mast
falls down etc.
These events are fortunately very rare. The loss of maps in these circumstances is likely to only be a minor issue. In most situations the boat could still be safely managed even if no pilot books
etc are available.
A simple solution is to print a few emergency
paper maps from your electronic maps to cover the voyage.
system on boats is has got more reliable, with multiple batteries and sources of power such as solar panels
etc. Tablets, phones laptops and HH mapping GPS
have their own battery
supply. Electronic maps for these devices are inexpensive and many cruising boats are accumulating these at rapid rate as technology marches ahead and older devices are superseded.
My own boat has electronic maps on 10 devices, more than most, but these sort of levels of redundancy are becoming common.
Given the limited need for maps offshore
most of these devices have enough capacity in their own battery
supply to complete any voyage.
This is not foolproof, but there are more vital systems that have a higher chance of failure.