I use a Garmin Nuvi on my Touring. Not so much for GPS or anything else although the option is there. I use my phone in another mount for Waze, music, etc. The reason for the Nuvi is because when using the Garmin Eco-Route module I can set it up as instruments, mainly the tach which the Touring is sorely lacking. Another nice thing about is it will pop out of the powered mount so I can take it off when the bike is going to be parked for a while and lessen the temptation for thieves. While I believe both the Nuvi and the Eco route is discontinued they may be found on the secondary market.
Man, you guys get a lot of rain there, we get less than 30 days a year with rain.
bob