On Thu, 5 Jan 2006 14:43:43 -0600, "RB"
wrote:

What function does the internal battery in marine lorans play? Does it
power a residual memory core for when the set is off?

The problem is that LORAN technology predates the availability of low
cost flash memory. Just about anything that needs to be saved with
the power off, probably depends on the battery: waypoints, routes,
last chain, stations, etc.