the author of this app says:
This program interprets data from receivers that support the NMEA0183 protocol and presents the most significant data over a dashboard. It also supports basic map-relative position tracking. It presents speed, compass, altimeter, clock, satellite, signal reception and geographic position gauges. Maps in GIF, PNG, JPEG and BMP are supported. You can tap-and-move to measure distances, create NMEA-data logs and synchronize the system clock.