The 2004 tracer experiment of JET with injection of 13CH4 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D/NIMBUS solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local 2D deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. The measured local deposition of 20-34% is roughly reproduced if it is assumed that all returning hydrocarbons are reflected from the surface, the re-erosion of deposits is enhanced compared to graphite erosion and that ELMs contribute to the re-erosion. Modelled poloidal deposition profiles are very similar to the measured ones. The shape of deposition pattern is strongly affected by the divertor geometry near the injection point which casts a shadow onto neighbouring tiles. Deposition at the shadowed area and inside tile gaps was simulated separately with a simple model included in ERO and with the 3D Monte Carlo code 3D-GAPS. In gap simulations more than 10% of injected carbon is deposited in the gap and about 15% lost under the tiles, consistent with the picture obtained from post mortem analysis and EDGE2D/NIMBUS modelling.