Hello there,
Thank you for inviting me for the project. I am AS3 programmer, please check my reviews and feedback here at https://www.freelancer.com/u/programmerAS3.html for further reference.
Regarding the project, is it not good to use those already built ANEs rather than start something from scratch. ANE leverages the native function of the respective OS and device. When it is already available, is it necessary to start something from scratch? But at this point, I am just not sure, how accurate it is as this primarily depends on the device and the accuracy percentage.
Let me know, if you have questions.
Regards