What a great site, I can tell I Have alot to learn!!!!! Need advice, will be puchasing the first of 2 units listed above in the next few days.... Questions is will this SD card work in these units? It shows the River Channel in Dark Blue!!! keeps me out of trouble, Great Help for myself when Navigating Rivers etc, that I have not seen before, Or if I need to purchase a different version, please let me know, so I can Purchase the Correct cards, sorry to bother everyone. Thanks again God Bless Patrick.