Question: Wouldn't Shinzon have had to know where the enterprise is being assigned in order lure them to pick up B-4? Data's brain has a safeguard so his positronic energy signature cannot be tracked. And how did he know a different ship instead of the enterprise wouldn't come to Remus to pick up B-4?
BaconIsMyBFF
19th Sep 2017
Answer: Long range sensors can show the general location of specific ships (this is part of the reason Romulans and Klingons use cloaking devices). All Shinzon has to do is find a remote planet close enough to the Enterprise that would cause them to be the most prudent choice to investigate. It's definitely a gamble but not one that is made without calculation.
BaconIsMyBFF