excellent standalone app. I tried memory map and gave up after 2hrs. Navionics was intuitive and well laid out. I had to navigate the Fort Myers Sanibel bays and despite it being my first time in those waters the program allowed me to easily locate and navigate right through the ICWS into the bay and back . Map quality was great, interface was good. Plotted a track well and the tide feature helpful when guessing the depth of shoals. Well worth the money. Memory map required me to download maps via PC, this program was truly stand alone.