Bushnell GPS BackTrack Marine Personal Locator (Blue) Returns you to the dock, favorite fishing hole, or anywhere else; mark up to 3 locations; provides distance and direction back to your mark Compact GPS personal locator with intuitive 2-button design High sensitivity GPS receiver utilizing the latest digital technology Self-calibrating digital compass; marine related icons Weather-resistant; operates on 2 AAA batteries (not included); includes lanyard for easy transport