Derek Adams wrote:
A USB dongle is also used for C-Map charts to protect the charts from being
used in more than one place at a time.

I use C-Map charts with 'Software on board' PC based plotter software from
Digiboat.

SOB is free but you need the charts to be able to use it effectively. The
latest version includes AIS,ARPA and Radar displays.

I guess that would be because the charts that are unlocked on the CD
could be copied to more than one PC or hard drive? Without the dongle
they could be used in more than one place at the same time?

I'm only familiar with the C-Map charts on the NT+ chips. On those you
buy the chip preloaded with charts and whoever has it can use it.

Jack

--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)