Yep, those two things are fine together. And there is no real limit on how many additional outlets you can use on one outlet as long as the total current draw is not too great, as another poster already said. The two things you mention are both low current (less than one amp each) devices and so will be fine if powered at the same time from the accessory outlet.
Brian
Hi All,
simple question?
Is it OK to run a 1 into 2 12v adaptor from the accessory plug so I can run my GPS and charge my phone at the same time?
Bloody smart phones have no battery life and I run a Q4 comms set up so its working all the while I am riding
http://www.alibaba.com/product-gs/295090963/Car_USB_charger_with_Cigarette_lighter.html
Cheers
Poddy