Re: Help me pick which is best

Roy wrote:

Jack Erbes wrote:

The 76CS has a generous amount of internal memory at 115mb but it does
not have any external memory (a SD card slot for example).  If you
wanted to change from street and highway mapping to topo mapping on the
fly, you might need to have access to a computer to upload the new mapping.



Not necessarily.  Garmin units that accept their map products allow you
to load maps from different types of map products simultaneously.  You
can have street maps and topo maps loaded, and switch between them on
the unit.  You are of course limited to the max memory of the unit,
which could be more of a limitation if you want to load multiple map
products.  You might need access to a computer for *that* reason, but
not to switch map types.

Thanks for the details on that. I don't have a feel for the space required to map a given region with the Garmin products, nor for the map file size limitations. That is why I said "might", I was thinking in terms of the 115mb limit.

Can you create the Garmin product map files to the hard drive? And then speed up the process by simply uploading one or more of them to the memory in the 76CS?

On the Magellans the base map is always active, and you can select one other mapping product map file from the SD card to be active along with that. Is that the same on the Garmin?

As a postscript of sorts, I said that the entire U.S. can be mapped in about 15 files for DirectRoute and Topo 3D, that is about 15 files for each product or a total of 30 files.

Jack

--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)
.

Relevant Pages

  • Re: Help me pick which is best
    ... That's why the expandable memory seemed so attractive but then the battery is rechargeable, which I guess may not be a huge problem, but who knows. ... If you wanted to change from street and highway mapping to topo mapping on the fly, you might need to have access to a computer to upload the new mapping. ... In use I would have to change from one regional map to the next as I traveled, it takes about 15 regional map files to cover the entire U.S. with DirectRoute or Topo 3D. ... The process of making the regional map files is a little bit technical or arcane because, while Magellan says that map files can only be 16mb, there many, many, Meridian users that are making and using 64mb map files. ...
    (sci.geo.satellite-nav)
  • Re: File map performance
    ... could recommend me some tutorials about the best practices of file mapping, since I think if I develop straight forward way of mapping portion of a file which is needed currently, close un-needed mapping, such kinds of straight forward way is not of the best performance. ... When you map a view, unmap the view, and then map the view of the same area again, the data are still in memory unless you are running out of RAM. ... You will get a page fault when accessing the data again, however only a minor one (no disk access, only mapping the memory into the process address space), not a major one. ...
    (microsoft.public.vc.language)
  • Re: Basic questions about GPS devices
    ... How are maps made available to GPS devices? ... The assumption is that the mapping needs will vary from one user to ... Or is there third-party trail map data available? ... are shown on topo mapping. ...
    (sci.geo.satellite-nav)
  • Re: Still confused why working set larger than virtual memory
    ... I have modified my program to show even if there is no leak, the working set ... Some comments, In my program, I use two ways to hold file map. ... // basic file mapping test ... What you removed is exactly the "smart trick" to have memory ...
    (microsoft.public.vc.language)
  • Re: Decoding strategy
    ... Mapping is actually two-step process, ... address at which to map the file, this isn't necessary, nor does it to my ... needs physical RAM that's not available). ... This doesn't reserve any ...
    (microsoft.public.dotnet.languages.csharp)