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Either way, you can set the Sena for vox of tap onlyA little off topic but I've seen a lot of mentions on Sena's site to initiate conversations to tap the jog dial. Is the Sena a PTT system? Is there a VOX feature for the intercom part?
Our Scala TeamSet Pro is VOX or you can start or end conversation by tapping the button. But the Scala only allows one external Bluetooth connection and it looks like the Sena allows multiple.
My ipone 4s updated to turn by turn directions with the latest software update, and I'm sure it would probably work fine, until you are in an area with no cell phone coverage (like all the fun twisty mountain roads). It will also be using up your data plan as it updates position while you ride. Seems ok for a quick look at the map, but for turn by turn directions, I'm sticking with a satellite based GPS. Just my 2 cents.
Smartphones aren't great motorcycle navigation devices --cell coverage being a big reason, also cost (especially for travel outside the US or near a border), small screens, water penetration, etc, etc. Get a GPS if you want ongoing navigation.
Smartphones are good for route planning/intermittent access to services/weather/info/staying in touch, and they're better MP3 players than most GPS's are. My point--if you're looking for a comm system, get one that will work with whatever smartphone you're using, but this wont substitute for a separate GPS. A comm system that can talk to both phone and GPS independently is a good solution; this enables phone-headset communication not just for calls but with the smartphone features like Siri or other voice-controlled apps. If your smartphone is connected through the GPS, I believe you'll lose the option to talk directly to the phone (other than during a call).
If you use on the apps that preloads map data then cell/data coverage is no longer an issue. I find my phone harder to see on the bike than a gps though. Plus you have to modify your glove (or take it off) to use the phone touch screen on most phones. Lastly, I notice my phone gets warm in the sun on my 1200GSA. Part is probably air flow from the oil cooler too, but some phones with shutdown if too hot.
So, I'd say yes, you could do it. Play around with some of the free apps somewhere where you have data plan coverage first and see if you like it. I think Waze is on both Andriod and iOS and is free. They have added (or are adding) routing. On Android just use the google maps, which now will cache map data so if you create the route and preview it before you head out then it will already be on the phone and won't need a data connection.
Garmin also has apps for both platforms, but I haven't tried them. Too cheap to spend money on nav apps since I have a couple of working gps's. That being said, I guess I have bought Motion X drive for my ipad.