Actually, they aren't facts, cause I could be wrong, but here is what I think about SD cards.
I didn't realize that they come in different speeds. That can explain why some say that they see a big difference on POIs on SD vs internal memory. From the little I researched, I saw from 60X to 150X.
2GB and 4GB cards are the same memory size, it is just that the 4GB use different compression type. You have to use a device that is compatiable with that compression type...usually high end cameras. So I am guessing that most GPSr's don't. So don't go higher then 2GB 150X SD card.
Can anyone confirm what I stated?
There has been much discussion on this subject. It has been reported that a few units can utilize the 4gb cards. The compression factor you mention may be the reason others can't use them. I can't confirm if that is the reason.
I have heard, that the ones with a high-speed rating will sometimes not work. The reason, I cannot confirm. It seems that for now, the basic speed and up to 2gb is a safe bet.
The speedier cards have a purpose, like rapid capture digital cameras. Speed is not that important of a thing for our gps receivers reading our POI files.
Maybe an engineer can answer your questions.
Yeah, I am pretty sure that your device has to be able to handle the 4GB cards. Which, and I could be wrong, GPSs don't.
I don't think so - I have a 4GB card at 150x - it shows 4GB - upgraded from 2GB at 150x - it shows 2GB.
As you increase the capacity and speed - you do need a device that can handle both - cameras are a good example that take advantage of both - older devices will only handle 2GBs and at a slower speed regardless of what the card says
I believe my PALM Treo 650 can not see more that 2GB while the Nuvi 660 can see my 4GB card.
The newer Treos can see up to 8GBs
so I wonder if the 660 can handle 4GB cards. My coworker just got a 4GB card so I will test it on the c530 tomorrow.
There was a comment way back where one user contacted Garmin and tech support stated that some Garmin GPS (Nuvi's) and possible others can support up to 4GB SD cards for custom POI's
That would be cool!
The Zumo can handle SDHC cards - I have an 8GB in mine now, and it works perfectly.
Mio's can not handle SDHC, but have been confirmed up to 4 gig. The caveat is that they need to be 150x to work properly. You can get a 60x to work, but it's intermittent. I've tested 1 gig, 2 gig and 4 gig, from 50x to 150x. I have I think 15 full length movies, all my maps, plus all my custom skins and stuff on a 4gig 150x OCZ card, and it works great.
Wow, 150x? The 8GB card I got is a class 2, which I believe is only 2MB/sec. Slow, but it doesn't seem to have an adverse effect on the Zumo.
It was only 60 bucks. I think the high capacity, high speed SDHC cards are a lot more pricey...
NUVI 350 and later works with 8GB SDHC. Speed is not an issue though because you have plenty of space internally to handle critical stuff.
You may need to update your firmware in order to support the SDHC format. Out of the box my Zumo did not support SDHC, but the update did the trick. Also note that your existing SD card reader will probably not work. So you will need to buy a new one or always transfer data (like MP3's) through the GPS. With an 8Gb card, that can take a long long time.
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