Why plan the return before leaving?
Short answer
Return may face different tide, weather, fuel, daylight, and crew condition
Return occurs later with changed conditions and resources, so a reciprocal line needs new appraisal. Mirroring the route or delegating the decision hides changes. Revise Treat the Return as a New Operating Problem.
Sources and scope
Reviewed by Richard Moore on . This answer is scoped to united kingdom and general recreational seamanship; check the current chart, publication, local rules and official operational guidance before acting afloat.
Quick check
Why plan the return before leaving?