Positioning System (GPS) satellite constellation and satellite-based augmentation system (SBAS).  Wide Area Augmentation System (WAAS) is one example of SBAS. It also supports EGNOS, MSAS and GAGAN to the extent that they are compatible with WAAS.

NexNav Micro-i GPS products, modules and GPS sensor units, have been designed to meet the requirements of both TSO C199, Appendix 1, Section A1.2.6 for TABS and the position source performance requirements of 14 CFR §91.227(c) for ADS-B OUT. Accordingly, the currently targeted applications for the NexNav Micro-i GPS products include aircraft exempted from carrying a transponder or ADS-B equipment (such as gliders, balloons and aircraft without electrical systems) optionally equipped with TABS and experimental aircraft requiring a 14 CFR §91.227 compliant ADS-B OUT position source. Depending on how the regulatory and policy situation evolves, potential future applications for NexNav Micro-i GPS products could include use as a 14 CFR §91.227 compliant ADS-B OUT position source on UAS platforms and on Part 23, Class I & II TC’ed aircraft.

The primary function of Micro-i is to compute the position, velocity of an aircraft and the precise time (PVT) and provide the output to the host system, such as a transponder. It also computes the integrity of the PVT from the SBAS signal, if available. Micro-i detects the failed satellites (FD) using receiver autonomous integrity monitoring (RAIM) algorithm, whenever there are enough number of satellites to support the FD.

The NexNav Micro-i GPS SBAS OEM module receiver includes part numbers 14000-1 and 14000-4.  The 14000-1 part number indicates a refresh rate of 1 Hz and the 14000-4 part number indicates a refresh rate of  4 Hz.  Except for the refresh rate differences the two part numbers share the same form, fit and function.