Snooper s7000 question

I bought the snooper s7000 a week ago, can’t fault it for everything it’s meant to do. Tried to put some movies onto an SD card yesterday and assumed it needed to be in mp4 format so I converted the film on the computer, put it on the card and put it in the sat nav. It reads the card and I can see the file on there but it won’t play the film? Am I selecting the wrong format and if so what should it be? Thanks in advance!!

Your not using an sdhc card are you ?

It needs to be in a Windows Media Format I asked Snooper support a while back and that was the reply.

Yes it’s a 4gb sdhc card? Does this make a difference? Thanks

They not compatible if i recall correctly you can use sd cards but not hc hc is high capacity which the units dont take