my recently acquire RINO 530 unit frequently lock up when in use in the field . sometimes I can use the power button to reset it , but other time I have to remove the battery to get it to reset . if you be rely on this to keep in emergency contact with other hunter and\/or hiker , be prepare to check it frequently , as when it lock up , the radio also cease to operate . I notice from other review of rino -lrb- eg the 130 -rrb- that this be a family problem . another more serious design flaw be that the antenna have already work loose after just 4 day of use in the field . perhaps this be because I use it to pull the unit out of my pocket -lrb- but give the size of the 530 with it li-ion brick pack , that be about the only way to get it out -rrb- . the antenna -lrb- actually the rubber cover -rrb- be merely glue to the top of the unit , and as the antenna flex under normal use , its just a matter of time before it will come off . there be few glue that can stick to flexible rubber well , and this be not one of they . this clearly do not live up to the ` ruggedness ' claim in Garmin 's spec . I like the feature this unit offer ; great color display -lrb- with day and night setting change at sundown to aid visibility -rrb- , great battery life -lrb- never a strong point for its etrex model -rrb- , and a powerful radio . also , it be very fast at acquire satellite signal by virtue of it be 2d - -rrb- 3d mode transitional lock ; something my eTrex Legend have be very slow to do . however , give the two problem note above , I must return this to the manufacturer and wait for a better offering . that be a shame as Garmin have corner the market for integrate radio\/gps device , so I can only hope they get this ready for market before the next season be upon we .