By George Schlinkert, VP Routing Services
As you analyze the energy efficiency of your fleet voyages and EEOI calculations, it is also helpful to recognize the impact of sophisticated weather routing to reduce CO2 emissions and provide a shorter route to save costs. The IMO recognizes weather routing as a fuel saving tool, and this should be considered along with EEOI calculations as you look for strategic solutions to invest in.
The EEOI is a measure of the fuel consumed in relation to the cargo carried and distance sailed. In the example below, it can be seen that a master intended a route of 5811 NM, but sailed a StormGeo recommended route of 5603 NM. The cargo carried was of course the same regardless of the route selection. The ship consumed 565 MT of fuel on the actual route, as compared to 653 MT on the intended route. The ratio of fuel consumed per ton-mile was 0.112 on both routes! The ratio results, while the same, may seem surprising. But in fact,, the ship consumed and emitted less CO2 when sailing the StormGeo recommended route.
It is of course the same ship on both routes, but for EEOI purposes, the efficiency of the voyage and lower fuel consumption along the recommended route is offset by the shorter distance.
In the following Route Spotlight, the efficiency of weather routing can be seen on a voyage from the Caribbean to the Baltic for a refrigerated cargo ship loaded with fruit and bananas.
Obviously, there are serious commercial pressures to deliver the product in a timely and cost-efficient manner. Prior to the receipt of the recommended route, the master advised his intended route which called for the following:
Rhumb lines via the following way points:
-09 24.5' N 079 55.1' W
-09 47.3' N 079 37.5' W
-18 00.0' N 068 20.0' W
-19 16.2' N 067 29.8' W
-49 00.0' N 006 00.0' W
Then, using shortest way points via English Channel/ North Sea/ Great Belt and Baltic Sea.
In the image below, StormGeo recommended the more northerly route for the voyage (red ship) and this was closely followed as compared to the master’s intended route (yellow ship).