![]() Most all of the commercial products include some free demo period that serves to show the unique features they offer, and indeed it is worth checking out a few contenders. (2) Must be truly free, not just a temporary demo. A popular example of these would be the many Navionics products. ![]() These can be quite good and the products cost effective, but they are not included here. A large number of these commercial ECS use third party vector charts that they produce themselves based on the official charts. (1) Must show either or both official RNC and official ENC. ![]() To clarify our shortlist amongst these hundreds, we have these criteria: Together this is called an electronic navigation system (ECS). There are hundreds of computer and tablet programs that display echarts in some form and also accept a GPS signal for moving map navigation. ![]()
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