This study deals with the development of a new geoprocessing tool useful for wet gap crossing during military operations. At present, there is no software in the Czech Armed Forces that an engineer staff officer can comprehensively use to analyse wet gaps. The use of this geoprocessing tool will allow a faster and more efficient task analysis in the planning process. Members of the staffs of individual battalions of the 7th Mechanized Brigade, the 151st and 153rd Engineer Battalions and students of the University of Defence experimentally verified the usability of the geoprocessing tool. The advantage of own development is the possibility of updating the geoprocessing tool and admin options. The proposed geoprocessing tool can also be used as an interoperable element in the planning process of international task forces. The issue of wet gap crossing also confirms its importance from the conflict in Ukraine (e.g. of crossing the North Donetsk, Dnieper River) and also by the acquisition processes for newly acquired combat vehicles and support assets (military bridge vehicles, pontoon bridge set).