These are called S-63 format ENC, whereas we are restricting to S-57 ENC. (4) We are not requiring live GPS functionality, just chart viewing, and we are not requiring coverage of encrypted ENCs or RNCs sold by other nations. These are essentially the same viewers we see at their chart selection options (see /getcharts). Click the (i) icon on the ENC viewer to get into a cursor pick mode. Thus we do not count several online viewers, notably the NOAA viewer for ENC and their NOAA viewer for RNC. (3) Must be stand alone product for PC or Mac or mobile device. Prices range from $50 to $2,000 or so, with several popular products in the $300 to $500 range (Coastal Explorer, Time Zero, WinGPS, to mention just a couple we are familiar with.) 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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