Great 46er. Looks like you were posting that at the same time as I was writing my POI instructions above. Let me know how it goes if you install the custom POI file on your Nuvi.
I rarely use the POI's, but will give it a test. I stored your file on an SD card. For others doing the same, make sure you have a 'GARMIN' directory on the SD card into which you copy Boyd's file. Not sure about this, but I believe you will need to have the SD card to load Boyd's maps whenever you want to utilize them, they will not be in the NUVI's memory. As my NUVI is now setup, I have the City map & my custom TOPO2008 maps in memory, with Boyds maps on the SD card. Very convenient.