In practice, a mapper would delineate Shore Units first, then cross-reference which Shore Units would be included in a particular Exposure Unit. Figure 7 provides an indication of Shore Units nested within Exposure Units. Maximum Fetch Distance - the distance in kilometres of the maximum fetch as measured along the Maximum Fetch Direction. Fetch Distances - the distances in kilometres as measured along a line 45 to the left of the Shore Normal, along the Shore Normal and along a line 45 to the right of the Shore Normal. Modified Effective Fetch - the distance in kilometres as computed from the Fetch Distance Measurements.
Waves are low most of the time except during high winds.
Swells, generated in areas distant from the shore unit create relatively high wave conditions. During storms, extremely large waves may occur. Exposed - maximum wave fetch distances greater than 500 km. Once the materials are assembled, the first step for the coastal mapper is to review a section of coast and define the shore unit boundaries. 7 illustrates an example of a base map with the units delineated.