I think something here is being missed when discussing Darth Maul and his discretion....
There are still Jedi across the galaxy and especially on Coruscant...
They would fell something odd in the force if Maul were to just start walking around...
True Palpatine was able to, but Palpatine was also the master of stealth....and Maul was his apprentice still learning...
It is better safe than sorry, when you're the last two of your kind...
Yerssot,
I'm trying to remember correctly right now, but I believe that those conscious of the force put off an aurora.....
Those not conscious of it have to be deteched....
Think about the death star in ANH, Vader felt Obi Wan as soon as he opened himself to the force...
Vader also felt Luke in RoTJ as the Shuttle headed for Endor....& Luke wasn't even opening himself up to the force....
Maul was taught well by Palpatine for good reason....survival..