I do not know the specifics of the new jump drive mechanics. All I know is that I have coordinates that I assume does not work anymore.
I believe /help could help, but I'd rather have a human explain to me the specifics and how to actually jump, with an example, preferably.
basics:
use /jump list to see what systems you can jump to. systems that are far away cost more fuel to jump to, so you might end up having no fuel to return.
then use /jump systemname to jump to a system you can jump into. the jumpdrive will begin charging and will automatically open a jumphole to your destination once it reaches 100%