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Posted by Dave S on October 10, 2009, 5:43 pm


Dave S wrote:
> Dave S wrote:
>> I just bought a GPSMAP 76Cx for bicycling and hiking use.
>> It seems I missed the $50 off sale that ended 31 Aug, but the dealer
>> had pity on me and gave me $20 off.
>> It comes with a 1 GB microSD memory card. This isn't even big enough
>> to hold the whole City Navigator 2010 NT. I'm thinking I may want some
>> Topo maps as well, if only the free ones. I just looked at the free
>> Arizona install, and it is 177 MB on the computer.
>> This raises a couple of questions - can I put several maps on the
>> card, and switch between them, or do I need to install each map on
>> it's own card and switch cards? That might be tricky - those cards are
>> really, really small!
>> If I can put all my maps on one card, and I'm thinking custom POIs and
>> track points are also saved to the card, how big a card should I buy?
>> Dave S.
>
> OK, thank you to the many of you for your helpful comments.
>
> From last to first, here are some responses:
>
> 1. My USB ports are USB2.0. I believe the long time to load may be
> caused by a USB1.0 port on the GPS, but don't have any evidence for that
> right now.
>
> 2. My card reader does not in fact say that it can handle SDHC, so thank
> you for bringing that distinction to my attention. I can't take
> advantage of that EBay sale, since he doesn't ship to Canada, but I
> found a local dealer has something very similar for $10. Tomorrow I'll
> pick it up.
>
> 3. I guess I will have to experiment with loading maps one at a time or
> all together, since opinions seem to be divided on that. I just came
> home and saw that my transfer to GPS of CNNT + Arizona Topo + Hawaii
> Topo + New Mexico Topo had completed. Going to Setup / Maps I could not
> get it to just show me my position on CNNT. I shut it off in
> frustration, but then decided to try again. Then I noticed "Show none",
> and pressed "Enter" on that, then "Show CNNT", and pressed "Enter" on
> that, and voila, it was fine. And connected to 8 satellites while
> sitting in my office in my house! That's very strong!
>
> Next step will be to download more Topos from that gpsfiledepot site,
> pick up an SDHC card reader, and continue experimenting.
>
> Thanks again for the education.
>
> Dave S.

Its a new day, and I now have a card reader that recognizes a 4 GB SDHC
card.

In the meantime I was able to download and install the Ibycus Topo map
for all of Canada. What a work of art!

So this afternoon I selected all of City Navigator North America (which
no longer contains Mexico!) and the western Canada part of the Ibycus
Topo, plus Arizona Topo, New Mexico Topo, and Hawaii Topo.

This constituted 609 maps, 2252.5 MB.
It took an hour to prepare this for transfer, and 15 minutes to transfer.
There's still plenty of room on the 4 GB card for more.

Dave S.



Posted by ps56k on October 12, 2009, 2:20 pm


FYI - concerning flash & USB transfer rates;
USB 1.1 - 12mbit (1.5MB)
USB 2.0 - 480mbit (60MB)

Here's a quick list of some tests I ran
using a program called BART's Stuff
http://www.nu2.nu/bst/
I use the -> Options -> Quick Test

Dell C610 laptop with USB 1.1 port,
and Garmin 255 with micro-SD card,
vs a normal SD card reader.

SD Card - 920kb/s write 954kb/s read
thumb drive - 845kb/s write 925kb/s read
Garmin D: - 589kb/s write 552kb/s read
Garmin E: - 460kb/s write 560kb/s read
micro/adapter 896kb/s write 880kb/s read

and of course - YMMV -






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