The RCR-SDUSB remote SD card reader with a USB port provides remote microSD access to Axiom, Axiom+, Axiom Pro, Axiom Pro 2, and Axiom XL chartplotter displays. The RCR-SDUSB is recommended for Axiom and Axiom+ installations when the rear microSD card reader is not readily accessible. Axiom XL installations require a remote card reader like the RCR-SDUSB RCR-1 for microSD card access.