Ports and marine pollution expert Nature Group has proposed its maiden dividend after progress across its three divisions.Revenues increased by 52% to £21.78m, underlying earnings before interest, tax, depreciation and amortisation increased by 54% to £2.92m and underlying operating profit increased by 163% to £1.29m.Underlying earnings per share jumped 129% to 1.10p. Free cash flow increased by 31% to £1.02m.Underlying figures discount a £12.9m goodwill write-off from the acquisition of International Slop Disposal in 2010.Chairman Nigel Sandy said the results reflect the good progress that has been achieved in Maritime, Oil & Gas and Engineering divisions. "There have been challenges faced in the Maritime Division as we invested to meet changes in legislation, and delays in bringing operations in Gibraltar back online. However, with planning approval and the resolution of our insurance claim we can now look forward to operations in the future with confidence," he said.Shares in Nature were up 13.1% to 30.25p at 13:40 on Thursday.