inputs.text: love sailing - got garmin 78sc couple weeks ago use not water chesapeake bay hiking geocaching ive sailed 3 daysabout 15 hours total runtime alkaline batteries half gone according meter im fairly satisfied battery life havent tried nimh rechargeables yet concerned unit going huge intentionally large give internal air space water flotation ability not big heavy smaller expecting also buttons top screen little weird not big issue use fast finding satellites switching display screens etc built electronic compass multiaxiscalibrates quickly reacts quickly movement seems accurate option map orient either compass heading direction point gps track direction moving oriented \\up\\ third hand held gpsbefore high end magellan delorme topo maps much impressed unit others course technology marches famed \\ease use\\ garmin gpss known along raw capabilities unit marine use along faster speed far im happy marine functions hoping included g2 coastal marine charts good readable bright sunlight \\man overboard button\\ pressed held not marks position immediately give option navigate back position also \\anchor drag\\ alarms well low water depth high water depth alarms key chart depth readings low tide alarms adjustable user bought separate garmin boat mount made unit not mounted boat 3 screw holes required seems hold unit well adjustability viewing angle like handheld garmins \\basemaps\\ 78sc land not waterare fairly useless optional maps expensive recently loaded separately purchased topo 100k us maps dvd loaded many map regions 78scs internal memory 16gb think 70 continental us would fit took hours convert upload via usb not try loading maps separate microsd card not used topo maps yet geocaching functions garmin unit seem impressive looking menu options like said far im impressed looking forward learning capabilities unit well checking topo maps geocaching functions