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  1. #1
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    Default Maximum card size gpsmap 400 series

    Hello,

    I'm wrestling with my Garmin gpsmap 421s, marine gps unit.
    Does anybody know what the maximum size memorycard is for this unit?
    I tryed 4Gb that worked but before buying say 16Gb i would like to know if this is possible..
    Looked in the booklet but cant find it there.

    Bye SoFTSTuff

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  3. #2
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    Quote Originally Posted by softstuff View Post
    Hello,

    I'm wrestling with my Garmin gpsmap 421s, marine gps unit.
    Does anybody know what the maximum size memorycard is for this unit?
    I tryed 4Gb that worked but before buying say 16Gb i would like to know if this is possible..
    Looked in the booklet but cant find it there.

    Bye SoFTSTuff
    looks like "at least 8gig" (visit the link). Sometimes Garmin advertizes the "Max size they have tested" and it may work with a 16. Perhaps a 421 owner will respond with info on a 16gig.

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  4. #3
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    Plotters can see one Bluechart per sd only, I think big sd is useless
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  5. #4
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    Quote Originally Posted by catymag View Post
    Plotters can see one Bluechart per sd only, I think big sd is useless
    ... and map above 4Gb in separate gmapsupp.img is not supported by Garmin device!
    Do you mean this fact?
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  6. #5
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    @softstuff
    In clarification, a 4'GB' [gigabytes] card will have somewhat less than 4,000,000,000 bytes available for storage [see full explanation [Only registered and activated users can see links. ]]. The so-called garmin image size limit is in fact a file size limit imposed by the FAT32 file system and it's actually 4GiB [gibibytes] less 1 byte, i.e. 4,294,967,295 bytes. So if you have a really big chart approaching 4GiB [gibibytes] in size it simply cannot fit on a 4GB [gigabyte] card anyway.

    Part of the secret to dispelling the misunderstanding about these 'size limits' lies in using the currently accepted terms [gigabyte for decimal and gibibyte for binary when talking about drive memory], as well as the correct widely accepted standard abbreviations [e.g. KB, MB, GB, TB for kilobyte, megabyte, gigabyte, terabyte and similarly KiB, MiB, GiB, TiB for kibibyte, mebibyte, gibibyte, tebibyte]. Using nonstandard abbreviations can be really confusing, for instance Gb is actually short for gigabit [but i do it myself lazily sometimes] so it's clearly wrong when used for gigabyte and while saying 'gig' verbally is quite universally acceptable for gigabyte it's therefore perhaps an almost acceptable 'non-standard' written abbreviation.
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    I really believe card size in itself would not be a problem for your plotter, but it's quite pointless using bigger than 8GB anyway when it can only use one image not larger than 4,294,967,295 bytes [~4.29495GB]. Regardless, most charts will fit on a 4GB card
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