The new Gear Whores Anonymous Base Strap Mk1 is available for pre-order at NextGen Warfighter. This is a replacement band for the Suunto Core or any other watch of similar size. It requires the use of readily available conversion lugs in order to attach to the Core.
The Base Strap also has a small section of strap that is specifically designed to accept a Suunto Clipper compass. When the Core and Clipper are placed together, the wearer would have two very capable land nav tools close at hand.