Schedule Variance
Deviations from the planned arrival times of ocean going vessels disrupt the synchronization of global supply chains. Occasional maritime transit delays occur when ships cannot maintain their speed or are forced to wait for berth space at a port. These interruptions increase the time it takes for cargo to travel from the point of origin to the final destination.
Causal Factor
Environmental conditions and mechanical failures are the most frequent sources of these setbacks. Severe storms often force captains to reduce speed or take longer routes to ensure the safety of the crew and the cargo. Mechanical problems with the main engine or the steering gear can leave a vessel stationary until repairs are completed.
At the terminal, a lack of available cranes or a shortage of truck drivers prevents the ship from unloading on time. This creates a queue of vessels waiting outside the harbor, which further extends the maritime transit delays for everyone in the line. Shipping alliances try to manage these issues by sharing vessels and coordinating schedules, but a major disruption at one hub often ripples through the entire network.
Automated tracking systems provide real time updates to help logistics managers adjust their inland transport plans.
Economic Effect
Inventory holding costs rise when goods are stuck at sea for longer than expected. Chronic maritime transit delays force retailers to carry higher safety stocks to prevent stockouts during peak shopping periods. The loss of predictability in the schedule reduces the overall efficiency of the manufacturing process.