Next message: (no name): "T&T: Chartplotter installation"
Steve, I realize this is a topic of debate. Garmin's display clearly warns of your view being over zoomed. Whereas, until I just upgraded the software on my Raymarine units, they would not go to full zoom. The reason being that the scale increments were such that in one scale you didn't have a full scale view and the next magnification would create an over zoom. Therefore, given the option of over zooming or not getting a full view, I'd opt for the slight over zoom in some situations.
Whether over zooming or looking at a chartplotter display in normal mode, we should all realize that everything illustrated on the map has a degree of potential error. So don't bank on the shallow rocks being exactly where they show on the maps.
Gil
>
> From: Steven Dubnoff <>
> Date: 2004/09/21 Tue PM 01:11:15 EDT
> To: <>
> CC:
> Subject: Re: T&T: GPS
>
>
> >You asked for opinions on the best GPS. I assume you are looking for a
> >chartplotter and not just a GPS. If so, having used Raymarine and Garmin,
> >I would go with Garmin's 10.4" system. Garmin allows for overzooming....
>
>
> Why is that an advantage? Overzoomed vector charts are a very good way to
> land on the rocks. Quite simply, you think you have more detail than is
> available in the original charted data. For an explanation and some
> examples see Nigel Calder's _excellent_ book, "How to Read a Nautical Chart".
>
> My Raymarine shows cross hatches on the large scale portion of a stitched
> chart view. It is a reminder to me _not_ to believe that part of the chart
> at the selected scale. That is a feature that is worth paying for.
>
> Best,
>
> Steve
>
>
>
>
>
> Steve Dubnoff
> 1966 Willard 47' Dover Pilothouse
>
>
>
>
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