Here is a thought, curious what others think.

How about a 2 tier certification for these systems?
First, and least expensive, is "day only VFR". This would be made up of COTS GPS units and "performs like" transmitters.
Second, and more expensive, Day/night and IFR certified.

The first type is likely what is currently allowed in US experimental. You don't really need the precision since it just gives a heads up and the visibility is good enough to allow you to find the potential conflict aircraft. These units may also have a max height restriction......comments on this?

The second type NEEDS the precision since visibility may be next to "0" so you need the precision.

Yes, it means the FAA will need to make changes. Then again, we now have a sport recreation pilot certificate that has similar restrictions.

If the FAA agrees (possibly with nudging from AOPA, SSA and others), it may make adoption that much more likely.

Thoughts?