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  1. #1
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    Default Info concerning SDcard size and Maximum Tiles

    Hi
    I came across this info on the Garmin site,this may useful for Poeple With the Etrex 20 & 30



    What is the largest size microSD card I can use with my eTrex 20 or 30?





    The eTrex 20 and 30 have an expandable memory slot into which a microSD* card can be inserted. This card provides the

    ability to install detailed mapping to enhance the device's internal basemap.


    It is recommended a standard speed card, no larger than 32 GB, be used in order to get the best performance from the

    device. Class 4 to Class 10 is considered standard speed.

    While considering memory limitations, another limitation is the number of individual mapping segments. Roughly 3,000

    mapping segments can be transferred to the eTrex 20 or 30.

    The eTrex will pick and choose which map segments to show when the map segment limit is surpassed. It is suggested to

    transfer additional mapping segments to another microSD card.

    *While any microSD card brand should work, Garmin has only tested more common brands such as SanDisk and Kingston.

    I tried it on a 8GiB Card,
    I copyed Finland Topo 2,Norway adventure Topo.Sweden topo 3,Danmark topo 2 and Kort Icland Nt2011 img,renaming the images
    Gmapsupp,1,2 ect.I had 2649 tiles.for all the images

    I merged the 4 Image files for Sweden topo with Gmap tool.
    All works alright,bit slow tought,its only a class 4 Card

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  3. #2
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    Thanks
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  4. #3
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    Caty, if interesting below the same info for other device

    Code:
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    Old device:

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    Automotive device:

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    Marine device:

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  8. #7
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    Quote Originally Posted by rollmops View Post
    ...........
    All works alright,bit slow tought,its only a class 4 Card
    The slowness is to do with the amount of map data that the unit is having to deal with. The class (speed) of the card only indicates its write speed, the read speed is the same, class 4 - 10. As the unit usually does not write to the card but only reads from it, the class is of no importance when it's used in the device. But it sure helps when you are writing large maps to it in a card reader.
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    DO I need to format the card in FAT32 in order to make my etrex 20 work with it?

  10. #9
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    @Neil

    This is wrong:

    The class (speed) of the card only indicates its write speed
    So class 4 is 4Mb/s not always
    Look here:

    Spoiler: CLICK
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    or

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    Last edited by lolypop000; 25th August 2012 at 17:32.

  11. #10
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    This is what I found from experimenting.
    If you use the card in a usb2 internal card reader you get write speeds which are fast (determined by the speed of the card and card reader ).
    Im getting 3.6 MB/second write speed ( Windows 7x64 i3 internal card reader usb2)
    If you use the card in the Garmin the write speed is determined by the firmware of the Garmin (I'm getting 800Kb/second write on windows 7x64 i3 usb2 nuvi 1300)
    The card is Sandisk 4GB Micro SD HC.

    I don't think that using a faster card would improve performance in the Nuvi.

 

 
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