Tracking and data viewing and export are excellent. NOAA chart integration is perfect. Highly recommended.

iSail is the perfect combination of gps tracking tech and time honored and trusted NOAA charts. Easy interface allows for quick waypoint and route creation, and accurate speed over ground, course over ground, and location tracking over time. Adding new charts and their upclose inserts from all over the US is quick and intuitive. Highly recommended for day sails and multi-waypoint long distance trips.

I have been using it for 8 years. Tracked to Bermuda BVI and Florida to Baltimore. Charts are free mine has no subscription

After investing a little time to understand this app, I found it to be extremely valuable and accurate. I was won over, when we used it to navigate across the Chesapeake Bay at night. The waypoint marker we were heading to was supposed to be a flashing light but the light was out and we were a little uncertain that we were on course. When we suspected we should be at our destination marker we turned on our spot light and found ourselves perched with the marker on our port quarter. Can’t believe this app is only $7.99.

Have tried several programs - this program seems to be the most battery friendly and is a good backup program. Very stable. Main limitation seems to be the app only works w NOAA charts so no international use.

I couldn’t find the specific chart for the area , Friday Harbor, San Juan islands, Wa. I left a message and he called me back on Sunday afternoon and helped download the chart I needed. Thanks

I like how this app uses the straight NOAA raster charts. Also don’t have the login and in app purchase issues that I’ve had with competitors.

I have used this app on my phone to navigate my sailboat at night from San Diego to Catalina and arrived at Avalon dead on the mark and within five minutes of the predicted ETA. While it’s less convenient than a dedicated chart plotter, it gets the job for a fraction of the price.

I love this app! It gives me exactly the info I need when racing or just sailing. I’ve set waypoints for all the government and private buoys we use to set our race course. Then all I have to do is create a route by choosing the waypoints to be used for that day’s race. Then I have SOG and bearing and VMG to each mark and more. Amazing! The learning curve is a bit steep, but well worth it. And if I have questions, the developer is super-quick to respond. Highly recommended.

I bought this to use on lakes that I boat on but to my dismay none of the lakes have charts that I could find so this app is totally worthless to me. I guess it’s only for boating on the ocean or coastal areas.