LakeMaster Humminbird Cards Are Compatible With The Following GPS Units: HUMMINBIRD R Simply. Clearly. Better. LakeMaster - Humminbird Compatibility List New Humminbird GPS/Sonar models will come preloaded with the updated software to run LakeMaster GPS charts. For older Humminbird GPS/Sonar models, you may be required to download an update from the Humminbird Website www.humminbird.com. Once you have registered your product you will have access to the update, which will require you to download a file to a blank SD card. After the download is complete, insert the SD card into your GPS unit, follow the on screen instructions, and your unit will now display the LakeMaster Humminbird Digital Fishing Charts. LakeMaster Humminbird Cards do not work on GPS units other than the Humminbird Brand. DIGITAL GPS MAPS Model Software upgrades available at www.humminbird.com Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Model Software upgrades available at www.humminbird.com 937c/937cDF 947c 3D 997cSI 955c cp 957c 917c 967c 3D 998cSI 958c 1157c 1155c cp 1197cSI 785c2 cp 597ci HD DI Combo 597ci HD Combo 385ci Combo 587ci HD Combo 786ci cp 785c2i cp 797c2 SI 797c2i SI 787c2 787c2i 798ciSI HD 798cSI 788c/ci HD 788c 898cSI 858c Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Available Now Matrix 97 1198cSI 1158c