What is the difference between the flash memory storage cards SD & SDHC? The reason I ask is because I have a Sat-Nav that says it takes up 4Gb SD cards. But as far as I can tell 4Gb SD cards are SDHC, now I have an 8Gb SDHC and am totally confused as to whether it will work or not.
(I realise that this is a computer forum but if it makes anyone feel any better then I'll let you know that my Sat-Nav runs on Windows CE [and therefore must be a computer :p ].
