I am studying the level of shipping traffic in a harbour area and have each transit by a ship as a line in one big Points to Line file. I want to display line density per 100m-squared. I have tried various combinations in the Output Cell Size and Search Radius boxes, but everything comes out super 'vague' - it paints most of my study area one colour, and only the marina itself is displayed as having higher density, whereas I know the shipping lanes should show much higher density. I'm very new to using ArcMap, so if anyone could tell me what numbers I need to put in to get density/100m2 that would be very much appreciated. Thanks!