AS CR SD/MMC Card Reader 700037-1 USB Memory Card Reader (memory card not included) This card reader plugs into a USB port on a computer and allows your computer to read SD and MMC cards. This will allow you to update the software on your unit. If you require software, we can send it to you for a small fee, or you can download it and install it yourself from humminbird.com For Use with 1155c Chartplotter 1155c Chartplotter NVB 1157c Combo 1157c Combo CHO 1157c Combo NVB 1157c Combo NVB CHO 1197c SI Combo 1197c SI Combo CHO 1197c SI Combo NVB 1197c SI Combo NVB CHO 727 737 755c Chartplotter 757c Combo 757c Combo CHO 767 Combo CHO 785c2 Chartplotter 785c2i Chartplotter NVB 787c2 Combo 787c2 Combo CHO 787c2 Combo w/o GPS 787c2i Combo 787c2i Combo NVB 797c2 SI Combo 797c2 SI Combo CHO 797c2 SI Combo NVB 797c2i SI Combo NVB 917c Combo CHO 917c Combo NVB 917c Combo NVB CHO 937C DF CHO 955c Chartplotter 955c Chartplotter NVB 957c Combo 957c Combo CHO 957c Combo NVB 957c Combo NVB CHO 967c 3D Combo 967c 3D Combo CHO 997c SI Combo 997c SI Combo CHO 997c SI Combo NVB 997c SI Combo NVB CHO Matrix 97 Combo Matrix 97 Combo CHO May not be exactly as shown Part # 700037-1