What do you plan to do with the electronics if you only sell the boat? Are you going to be able to use them? Are you going to be stuck with them collecting dust and losing value?You could list the boat for 10K and say the electronics are available for x amount more.... Be prepared, if you want 10k, and you list for 10k, people probably arent going to offer you 10k.... So you will have to work that into the equation as well, or just say 10k FIRM......Maybe state that there is wiggle room if they buy the electronics as well....
I would personally list everything together at first, and if that doesnt work, separate them.... I feel like it is a pain to get rid of the boat and get stuck with the components....It all depends on how quickly you NEED to get rid of the boat. If you have time, try listing everything together. If you are in a rush, sell he items individually.