Hi Jill. I use both electronic CHS (government) charts, Navionics for an iPad and Garmin BlueCharts in my GPS. They all cost $. I find the CHS charts best. They are identical to the printed charts. The newer ones have quite strong encryption on them which makes it difficult to share with others, as was the intent since they are Copyright material, but I have a set of older charts that work sufficiently well for kayaking when one does not need all the nav aids to be updated etc. Some SKABC members have used these with usccess. If you want a specific chart or group of charts for an area please let me know which ones. I might be able to help.