Letter Agreement Clarifying Exclusive License and Distribution Agreement between Reduct NV and Geospatial Mapping Systems, Inc.

Exhibit 10.6

April 17, 2008

TO WHOM IT MAY CONCERN

To clarify our understanding of the Exclusive License and Distribution Agreement (the “Agreement”) dated August 3, 2006 between Reduct NV and Geospatial Mapping Systems, Inc. (“Geospatial”) and the two successive addenda dated December 21^st, 2007 and March 21^st, 2008, we confirm that should Geospatial fail to pay Exclusivity fees as defined in Schedule 3.1 of the Agreement other than payments already agreed, or should Geospatial fail to achieve at least 70% of its Intercompany Sales as defined in Schedule 3.1 of the Agreement, Geospatial will be able to use the systems in its possession freely and Reduct will continue to service those systems under normal commercial conditions. In case Reduct appoints a new or additional US distributor, we expect that Geospatial will be able to, directly or indirectly, purchase further Reduct systems.