With the proposed introduction of the EU’s monitoring, reporting and verification of carbon dioxide emissions from maritime transport (MRV), the maritime industry is investigating the various allowable options to record and verify its CO2 footprint. The primary reason behind the EU proposal is to develop MRV as a first step and benchmark regarding longer-term emission reduction targets and the possible introduction of market-based measures. Within the proposal, ANNEX 1, Method D allows for direct measurement of CO2 from engines, boilers, incinerators and other emitting devices.