I would have give it three star due to its mediocre usabilty , but the concept of this radio alone earn it the 4th star .  pro look really cool in dark green , people have ask I if its a satellite phone or military grade etc. . its a really great concept , and be the forerunner of next generation mobile phone location system . its a fun novelty to use , and the gp feature alone can be use in non-extreme adventure setting too - to track a run , bicycle or car trip in detail - time , average speed , top speed route , time stop etc. . . , and also have a feature call area calculater which you can use to measure size of land by walk around the land perimiter .  con  as you probably know , the coordinate send capability only work in the low power fr channel of the radio -lrb- due to FCC restriction -rrb- . I think maybe I could find some kind of hack to override this restriction on the radio , but no luck , still search . the way to make best use of the rino be to coordinate with other rino both one fr and one gmr frequency , and always scan between the two , just in case .  the unit will continue to send old , stale coordinate to the other unit if it have not get a new position fix to replace it . this be annoying because when you think you know where the other one be , so proud of you technology , you can be way way off , much to the humor of the person you show it off to .  you can not use this radio as a homing device - it can not be set to automatically send out datum at interval . -lrb- I think it would be against FCC rule for unattended broadcast , but it would be great - to attach to you child , pet , or girlfriend to make sure they stay out of trouble while at the park or beach . -rrb-