Locator in Mars Colony only shows where equipement is. It doesn't show single items like: MRE packs, samples, parts, seeds etc..
They showed that even a simple fruit can be located using a smal sticker-chip.
The system they developed it's simply locating where is what...it tells peeple where some equipement will be needed (mision objective).
Currently in MCC there is no way to check remotely how many GPR-shots are stored. You have to go and check it by yourselve. They showed that it's possible and better to keep track of every single thing that is in- or outside the base. In the example with GPR shots...when someone want's to check how many do they have left, he goes to the monitor, and ther's it's clearly labeled, and if there isn't enough of those GPR-shots, system will inform everyone that the base is low of them, and will suggest from where could it be transfered (where is more than needed) or produced.