I try on nuvi class2 and in city my map ar stuck or have empty screen for 1 or 2 sec.
Then i buy class 10 and map no more stuck when i drive in city.
p.s.
CN.img was the same on class2 and class10
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I try on nuvi class2 and in city my map ar stuck or have empty screen for 1 or 2 sec.
Then i buy class 10 and map no more stuck when i drive in city.
p.s.
CN.img was the same on class2 and class10
No it's not. From the offical [Only registered and activated users can see links. Click Here To Register...]: 'Speed Class and UHS Speed Class symbols indicate *minimum writing performance to ensure smooth writing of streaming content such as video shooting. This is important mainly for camcorders, video recorders and other devices with video recording capabilities. *Speed Class designates minimum writing performance to record video. The Speed Classes defined by the SD Association are Class 2, 4, 6 and 10.' [*Emphasis added]Quote:
Originally Posted by lolypop000 [Only registered and activated users can see links. Click Here To Register...]
I didn't say 'class 4 is always 4MB/sec', and anyway that's minimum writing performance. What i said was '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 on the unit. But it sure helps when you are writing large maps to it.' and I stand by that.Quote:
Originally Posted by lolypop000 [Only registered and activated users can see links. Click Here To Register...]
As stated, the Class (writing speed) is important in things like camcorders that are WRITING large amounts of data to the cards. Garmin units are not normally writing to the card, just reading from it. In further expanation, of 'The class (speed) of the card only indicates its write speed', this is in regard to the relative write speed i.e. Class 4 is faster than Class 2, 6 is faster than 4, & 10 is faster than 6.
The above is also what i have found anacdotally.Quote:
Originally Posted by dasilvarsa [Only registered and activated users can see links. Click Here To Register...]
Flash memory slows in relation to the the total quantity of data that has been written/overwritten onto it, so a lot of reformats and write-cycles will eventually compromise its read speed i suppose. Old cards are maybe slower because the 'wear levelling' capabilities are reduced. That relative read slowness effect you have experienced may be simply more to do with the relative write usage of the cards, rather than as you are thinking due to their class (which is the relative write speed only).Quote:
Originally Posted by lolypop000 [Only registered and activated users can see links. Click Here To Register...]
Sorry Loly, i think you have misunderstood me. ;)
Me too prefer to copy maps files using a card reader instead thorough the Garmin device. Writign speeds is much faster.Quote:
Originally Posted by dasilvarsa [Only registered and activated users can see links. Click Here To Register...]
A bit more on the relative writing speed of cards in the unit or in a card reader. Early Garmins have a 'USB1' connection capability only, which explains why write speeds are faster using a card reader with USB2 or 3 capability, i.e. the speed bottleneck is caused by the unit's USB write capability. Later units with USB2 capability can be limited by low speed class cards which of course cannot be written to faster than their relative write speed will allow.
USB1.1 write speed is 12 megabit [Mb] per second i.e. 1.5 megabyte [MB] per second [maximum]
USB2 write speed is 480 Mb/s i.e. 60 MB/s [maximum]
USB3 write speed is 5 Gb/s i.e. 625 MB/s [maximum]
SD Class 2 write speed is 2 MB/s [minimum]
SD/SDHC Class 4 write speed is 4 MB/s [minimum]
SDHC Class 6 write speed is 6 MB/s [minimum]
SDHC Class 8 write speed is 8 MB/s [minimum]
SDHC Class 10 write speed is 10 MB/s [minimum]
SDXC [UHS] cards have much higher transfer rates [both read & write in the case of UHS-II, however UHS-I SDXC and Class 10 SDHC probably have same minimum write speed of 10MB/s].
Looking at a couple of examples:
Your nuvi 660 has USB1: You put a 10 MB/s Class 10 SD into it and find it writes no faster than when you had a 2 MB/s Class 2. It can't because it's limited by it's USB1 to 1.5MB/s maximum, therefore not even capable of matching the Class 2 card's 2MB/s minimum write speed. Better to use a USB2/3 card writer which can easily exceed the write speed of any of those card classes, then even Class 2 will write noticeably faster than in the unit.
Your nuvi 3597 has USB2: You put a Class 10 in it and find it writes much faster than with a Class 2 [and relatively faster than with 4, 6 or 8 too]. But when you re-format an SDXC UHS-II [maximum theoretical transfer rate of 312MB/s] to FAT32 and stick that in it can't be written to by the unit at any faster than the USB2 limit of 60MB/s. Maybe better to use a USB3 card writer which has 625MB/s maximum write speed so easily exceeds the 312MB/s theoretical transfer rate of a UHS-II card, but it has a practical minimum write speed of 30MB/s as a UHS-II card anyway, however the card is now acting like an SDHC and so it probably has the minimum write speed of 10MB/s of Class 10 or UHS-I anyway.
It's actually not easy to compare write speeds because the standards vary. USB is given as maximum write speed. SD/SDHC is given as minimum write speed. UHS classes are given as a 'maximum theoretical transfer rate', which I dare say is in fact a read speed and therefore actual write speed is considerably less both 'theoretical' and in real-life. For UHS-I it seems the same as Class 10.
Ok, I have an Etrex 20!
I have 11Gb of Topo maps on the SD card. If I put all the maps in the GARMIN folder then some maps disappear due to the tile limit, ok!
So on the SD card I created another folder called EXTRAS and moved all the non essential map img's there.
As Etrex 20 only sees the Garmin folder, then the other maps are ignored as if they are not there!
But they are still there ready to be swapped between these folders when needed in a flash.
Another folder for extra maps seems to beat the tile limit.
:tea:
hi, waht id the max sd card size for the etrex30? 32G or 16G on class 10? i have somo problem with oine of 64gthat i format to 32G on fat32 but it isn't read form the gps!
read post n1
What are the file limitations of my outdoor mass storage or MTP device?
September 17, 2015
Code:When sending or creating files for an outdoor device, keep in mind the following device limitations :
Alpha 100
2,000 GPX files
4,000 waypoints
12,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
500 custom map tiles
250 BirdsEye Imagery files
Approximately 3,500 mapping segments
Astro (320)
2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Approximately 3,000 mapping segments
Dakota 10 / 20
2,000 GPX files
1,000 waypoints
2,000 geocaches
50 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Approximately 4,000 mapping segments
eTrex 10
500 GPX files
1,000 waypoints
2,000 geocaches
50 routes, 250 points per route
100 saved tracks
500 archive tracks*
10,000 points per track
Ability to add maps unsupported
eTrex 20/30 and 20x/30x
2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Approximately 3,000 mapping segments
D2, fenix, fenix 2, quatix, tactix
500 GPX files
1,000 waypoints
2,000 geocaches
50 routes, 250 points per route
100 saved tracks
10,000 points per track
unlimited points per fit file (limited only by storage space available on device)**
Ability to add maps unsupported
fenix 3
1,000 waypoints
50 routes, 250 points per route
100 saved tracks
10,000 points per track
unlimited points per fit file (limited only by storage space available on device)
Ability to add maps unsupported
Connect IQ supported (watch faces, data fields, widgets and apps); Connect IQ apps may fill available internal memory before file limitations are met
epix
1,000 waypoints
50 routes, 250 points per route
100 saved tracks
10,000 points per track
unlimited points per fit file (limited only by storage space available on device)
Connect IQ supported (watch faces, data fields, widgets and apps); Connect IQ apps may fill available internal memory before file limitations are met
250 BirdsEye Imagery files
Mapping segments vary by model:
Approximately 4000 on base model
Approximately 3500 on unit preloaded with Topo US 100K maps
GPSMAP 62 / 78 (series)
2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Approximately 3,000 mapping segments
GPSMAP 64 (series)
2,000 GPX files
5,000 waypoints
No limit on geocaches (outside of max number of GPX files supported and memory available)
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
500 custom map tiles
250 BirdsEye Imagery files
Approximately 3,000 mapping segments
Montana (series)
2,000 GPX files
4,000 waypoints
12,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
500 custom map tiles
250 BirdsEye Imagery files
Mapping segments vary by model:
Montana 600, 650: approximately 4,000
Montana 600t Camo, 650t: approximately 3,500 (due to internal mapping)
Monterra (series)
2,000 GPX files
4,000 waypoints
12,000 geocaches
200 routes, 250 points per route
200 saved tracks
200 archived tracks
10,000 points per track
500 custom map tiles
250 BirdsEye Imagery files
4,000 mapping segments
Oregon 200 / 300 / 400 (series)
200 GPX files
1,000 waypoints
2,000 geocaches
50 routes, 250 points per route
200 saved tracks
20 archive tracks (archive tracks can only be accessed via computer)
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Mapping segments vary by model:
Oregon 200, 300: approximately 4,000
Oregon 400c, 400i, 400t: approximately 3,500 (due to internal mapping)
Oregon 450(t) or 550(t)
2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Mapping segments vary by model:
Oregon 450, 550: approximately 4,000
Oregon 450t, 550t: approximately 3,500 (due to internal mapping)
Oregon 600(t), 650(t)
2,000 GPX files
4,000 waypoints
4 Million geocaches***
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
500 custom map tiles
250 BirdsEye Imagery files
Mapping segments vary by model:
Oregon 600, 650: approximately 4,000
Oregon 600t, 650t: approximately 3,500 (due to internal mapping)
Rino 600 (series)
2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks*
10,000 points per track
100 custom map tiles
50 contacts with 2,000 track points each
250 BirdsEye Imagery files
Approximately 3,000 mapping segments
Each GPX file can contain a mixture of waypoints, geocaches, routes and tracks. If the GPX file containing a waypoint or geocache is deleted, the waypoint will no longer be available on device.
When utilizing routes, only 50 points can be used for on road navigation.
*Archive tracks do not count against GPX file limit; 1 archive track per gpx file.
**FIT files do not count against the GPX file limit.
***Up to 4 million through OpenCaching.
Mapping SegmentsHTML Code:https://support.garmin.com/support/searchSupport/case.faces?caseId={0b02f820-03db-11e0-e050-000000000000}
What is a mapping segment?
September 27, 2011
Code:Detailed mapping software, such as City Navigator NT or Topo 24, on a DVD format will contain many mapping segments within MapSource or MapInstall. A mapping segment is one selectable area of mapping that can be transferred to the device.
The below image shows four mapping segments. The segment selected to be transferred to the GPS is highlighted in pink.
HTML Code:https://support.garmin.com/support/searchSupport/case.faces?caseId={f91dda40-ce9f-11e0-cf56-000000000000}
What is the largest size memory card supported by my outdoor mass storage or MTP device?
09/28/2015
Many Garmin outdoor mass storage devices include an expandable memory slot. A memory card can be inserted into this slot and used to store the following:
Additional mapping
BirdsEye imagery
Photos (on devices with camera)
GPX files including geocaches, waypoints, routes and tracks
When selecting a memory card, be mindful of the device requirements:
Card form factor (the shape of the card):
microSD card - Most Garmin mass storage devices utilize this form factor
SD Card - Colorado Series*
Card Speed Class (the speed information can be read from or written to the card):
Standard speed class - Most Garmin mass storage devices can use any card with a rating of Class 4 through Class 10
Class 10 and UHS speed class - VIRB, VIRB Elite, VIRB X/XE may experience stutter, pixelation or lag in the video quality when using a card rated below Class 10
Card Size (the amount of storage space on the card):
128 gigabytes (GB) - VIRB X and VIRB XE
64 gigabytes (GB) - VIRB, VIRB Elite and Monterra (card must be formatted to FAT 32 when using with Monterra)
32 gigabytes (GB) - Most Garmin mass storage devices can use cards up to this size
Smaller Cards - Devices will detected cards with as little as 64 megabytes (MB), but few maps will completely load to a card that is this small: Check mapping requirements prior to purchasing a microSD card
Manufacturer (Brand of Card):
While any brand of microSD card should work, Garmin has only tested more common brands such as SanDisk or Kingston.
In addition to the above memory card limitations, there may be other file limitations that apply to your device; for more information reference the FAQ, "What are the file limitations of my outdoor mass storage device?"
* A microSD card can be used with a SD card adapter
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