Cable-C for connection to Nikon Df, D750, D610, D600, D7500, D7200, D7100, D7000, D5600, D5500, D5300, D5200, D5100, D5000, D3300, D3200, D3100 and COOLPIX P7800, P7700, CoolPix A
Cable-C is for Solmeta Geotagger N1/N2/Pro, if you are using Geotagger N3, Cable-C is not compatible.