According to handgunlaw.us I read it that
http://www.handgunlaw.us/states/maryland.pdf...neither the firearm nor any ammunition being transported is readily accessible or is directly accessible from the passenger compartment. In the case the vehicle does not have a compartment separate from the driver's compartment the firearm or ammunition shall be contained in a locked compartment other than the glove compartment or console.
My concern is in a P/U or SUV - I am considering a Nanavault NV300 for my pistol so I can carry and it would be portable (use in any vehicle). I want to be legal.