<Per ARRL VHF/UHF Century Club Award Rules, paragraphs 4(e) and 4(f) stations who claim to operate from more than one grid locator simultaneously need to be exactly on the line or grid corner and document with a picture showing your equipment and a GPS displaying your location exactly on the line or corner and a GPS error no more than 20 feet.?>
I use a Garmin Oregon 750T handheld GPS when roving. I am also a geocacher and this GPS works very well for both activities. Check a grid line map on the Internet and use your pointer to get the coordinates. Plug them into your GPS and rove. Same for a four corner point. Other hikers handheld GPS units will work, I am sure, but I am familiar with this one. The touch screen is really helpful.
Brad KC9UQR