Hi all. In preparation for my first Ironbutt ride I relied on Google maps with a backup Garmin 550 from my cycling to give me accurate miles covered and gps speed readings (all info down loadable. Includes avg speed). Being old school I had good topographic maps for the whole distance with stops etc marked. I'm wondering about other ironbutter experiences and what works or not regarding Gps mapping or if its even worth investing. Also as I plan to solo a few rides, what works as far as Epirbs are concerned. I know there Is no right or wrong but would appreciate any input. Cheers and yippee. .jn