does my nuvi tell me of an upcoming speed camera?

If you have loaded speed cameras and have set alerts by either the Manual mode or by the filename and if alerts are enabled on your GPS unit, you will get the default tone when you come within the set proximity of the camera.

thanks again MM

How can you get your POI's (i.e. speed cameras) to work with the custom warning tones?

But, to keep it short:

Download the .csv, .mp3, .bmp files you want.
Rename the .mp3 and .bmp to match the .csv.
redlight.csv
redlight.mp3
redlight.bmp

make sure they are all in the same folder and use poi loader to install them to the unit. POI loader will do the rest.

If you are loading files that don't automatically have alerts turned on, run POI loader in manual and tell it to set alerts for the file when loading.