"I guess that depends on if they have a satalite pointed this way or not." Sparkplug says in an unsure way. You understand the ability to track things from orbit very well, but wonder how advanced the humans' ability to do so is. Taking Sparkplug's statement, you each think that their coverage with satalites is not total and there is a good chance that this place, so filled with trees and only a naval yard, is probably not a high priority to satalite surveillance. As well, you know that Sparkplug is not a military person himself and the level of military information he has is probably a good deal behind what is true.
So, you judge that you have a pretty good chance of not being seen at the moment by satalite but once you are caught on satalite, it will be very difficult to lose.