SIDs are divided into two general classifications : pilot nav and vector SIDs. pilot nav SIDs are designed to allow you to navigate along a specified route with minimal communications with ATC. These SIDs usually contain an initial set of instructions that apply to all aircraft,followed by one or more transition routes that require you to navigate to the appropriate fix within the enroute strucure. Many pilot nav SIDs include a radar vector segment that helps you join the SID.