Best GPS navigation app with offline maps and track saving!

Hi, I found this well made GPS navigation app where you can save your tracks to view later. Also it lets you preload maps to your phone so you can use them whenever you don't have a mobile signal. See this video for more info https://www.youtube.com/watch?feature=player_embedded&v=dYpiZm_HbGw It's also great for geocaching.
Check it out! https://play.google.com/store/apps/details?id=com.crittermap.backcountrynavigator.license&referrer=utm_source%3Dforum%26utm_medium%3Dlink%26utm_campaign%3Daleks