But this is not a very clean solution… when I copy optimal2.dat from another PC, it imports all the routings saved in that file and overwrites the routings I created on the current machine. It would be great to have a way to import/export only selected routings instead of replacing everything.
Is there any way to import a routing created on an external navigator into your onboard PC without deleting the routings you already have?

Is there any way to load a previously saved routing? Maybe I’m missing something, but every time I close EXP I have to recalculate the optimal routes again. 

Since FOG systems are beyond budget (>40k€), I’m considering alternative combinations.
Would you recommend LT‑500 + Garmin 24xd, LT‑500 + LT‑300, or LT‑500 + Furuno SCX20 (primarily for LT calibration and used mainly as a GPS)?
 

We have an option under Marks → Exchange → Send to Instruments. In the pop‑up window you can choose how you want to send the active route (Ethernet, COM1… whatever is connected to the EXP).What I don’t know is whether this information is sent only once, or if it is continuously transmitted to the instruments as needed for everything to work properly.The same question applies to XTE and other data. For example, if you move the active mark… or when your active route pass to the next mark..... do you have to be using send to instruments option?...

At least for now…From my point of view, after uninstalling the second NGT1 (which was used for GPS, AIS, and sending waypoints to the autopilot), all the “fast packet” errors on the network disappeared. When both units were installed, some sensors didn’t work properly (Cyclops gateway, YD engine data, etc.), with small micro‑freezes here and there. I imagine exp must have been quite frustrated........The primary NGT1 is the one used to connect the Processor to the N2K network.