What is the switch in the storage compartment in front of the shifter used for on a 2005 nissan sent...

It's possible it's a switch for the trans shifter, or perhaps a light switch.  It may also have been added -- does your car have fog lights from a previous owner?  Barring that, call a dealership and ask, they'll know.

i beleve it is a switch for fog lights.

The car has factory fog lights and the switch for them is on the left steering column with the headlight switch.The car is a six speed and this switch I am referring to really looks like a factory switch, not aftermarket. I am really curious what it does.  Thanks again for the help.   Dave

it's definitely something aftermarket because i own the same year & model as you and i don't have anything like that. what's it do when you turn it on?