Out-of-Stock Fishfinder modules Lowrance Sonar Hub Module - Lowrance HA1551 €648.00 he compact all-in-one sonar module offers StructureScan® HD and CHIRP sonar technologies for HDS and NSS Simrad Chirp series chartplotters: it provides extremely efficient pulse generation that ensures optimized target resolution and noise elimination, as well aswide coverage for perfect arcs that enable clear fish identification. View