Tider79
Senior Member
I hunt thick cover and I like to hike and fish. I have given some thought to buying a GPS unit that I can use for all three activities. Any suggestions on what to look for, what to avoid?Thanks.
Pricey...but an accurate, and sweet GPS.Delorme mine locks 3D in Rich Mountain Every time Plus you can download the overlay that looks just like google earth Plus i love the Digital Compass
lol...mine better say i have arrived, and be within a few feet of my stand!!!!!!!!But let's face it if one says 30 feet West and the other says 20 feet South as far as finding a stand etc. .
OK I will give you a simple rundown of why a handheld is not as accurate as most would like. First a little background bout me. I am the GPS coodinator for the Pandhandle office of one of the biggest surveying firms in Florida. I have been using GPS since the early 90's
Now, most common users of handhelds just look at the screen and what it is telling them but they are paying no attention to the sky and the orbital position of the satellites. On most handhelds it will give you a PDOP number. That is the dissolution of precision based on where the sat's are positioned. You also have VDOP (vertical) and HDOP ( horizontal) but PDOP is the combo of all the factors.
You can have 8 sat's but if 6 are clustered in one quadrant and 2 in another it will give a weak triangulation resulting in a higher PDOP and a poor lat/long value. A PDOP of 1.5 to about 3.5 is good, anything above that and the precision is affected. Even with WAAS turned on it is still subject since as far as I know here is only 2 WAAS sat's in orbit.
Even for us to get submeter accuracy it requires a few thousand dollars and we mainly use it to collect wetland boundaries but it is set to not collect any posistion above a 3.5 PDOP. Our survey grade GPS is accurate to within 1/4" but that will run you about $20,000 brand new per unit and you need a base station and a rover but we are also using a network RTK which enables you to collect data with one unit if you have the cell coverage. Even then with high PDOP it still can give you a 3/4 to 1 1/2" error when re-checking a point and that is using both the DOD sat's as well as the Russian Glonass birds.
Basically all I am saying is don't sweat it when your handheld is 15' off. Find where you can monitor the PDOP and tag places in optimum PDOP range and also when you try to go back to it and you will see your error's reduced by several feet.