I'm duplicating my post from the Installation and Configuration thread here as no-one seems to be replying or offering any solution to the problem!
"..There is definitely something not quite right with the app. After a full re-boot of the I-phone the audible alarms work! However, once the app. has been closed and then is re-opened for the next journey the audible warnings cease to function and only the visual ones are evident!...Has anyone else experienced this on the I-phone 3G with the "S" software update installed?"
Hopefully this may elicit some sort of response!