Im thinking I will get one use it on my bike and carry it when hiking and prospecting as it is i use a return date as a safety catch.
With the gps tracker your spouse or friends can watch your progress and know where you are on google maps.
That first link you posted gps service costs $250 ca. year works out to about $20 month they also have 3 and 6 month service ,
They sell this one at costco for $160 with no contract $15 a month gps service. be nice to find a plan for $10 Im going to keep looking.
The costco reviews were positive