Very versatile & utilitarian!

Like being able to open various facets (flashlight, compass, multiple maps, weather, etc) with easy on screen return to app function. Like the weather link which has link to NOAH advisories for your location. Works best when keeping app running in background for GPS locale/altitude functions. Really like SOS Feature which brings up pre-populated text of GPS co-ordinates and help request. Pro version is definitely worth the $!!!

Salembeaches about Altimeter GPS PRO AI, v4.40