polakis

how do you know that the accuracy wasn't so good? GPS will never give you exactly the same coordinates at the same location, it will always vary to a certain degree. that's the whole point of averaging: to eliminate the variance, or rather reduce its impact. the oregon will tell a certain "GPS accuracy" value, which is an estimate as to how accurate you can expect the current coord reading to be. it's not a guarantee, so it can be better than that or can also be worse. generally, if it shows you a distance to the waypoint of less than the accuracy reading most of the time, then the coords should be good. averaging itself also gives you an indication about accuracy, namely the "distance adjusted" value it shows you after you hit the save button. basically it's the amount of variance the oregon has encountered during the averaging process. the lower the value is, the more accurate you can expect the coords to be, and the better current reception conditions. in the best cases, you'll get 1 meter or very rarely even 0, and under those conditions you should be able to reliably get back to at least 1-2 meters distance to the waypoint. under bad conditions you can get anything over 7 meters or so - don't expect any reliably reproducable results under those conditions. I see, this seems logical. So i will take a new spot with waypoint averaging function, leave enough time even after 100% bar is complete and that's it. Thank you very much for your advice. It was very useful.

Thank you for the usefull info both of you provided. to dfx: i have done this, gone directly to averaging and marked the spot after the 100% bar was visible and i left it a little bit more. When i returned back to check the spot, i noticed that the accuracy was not so good. I repositioned the waypoint and then it was more accurate. Do you have any logical explanation for that, or it may happen some times? Thank you in advance

Yes this is correct. I had the same question with mine, the first day. This is something they should fix, it would be easier to delete them directly from the device like a common waypoint

Hi fellows, i am a happy owner of the Oregon 450t and i can say, it is a great device. I am on my way posting my first cache and i would like some help on using correctly the 'waypoint averaging tool' of 450t. When i want to mark a new waypoint for a cache, do i go directly to the waypoint averaging tool, or first mark the spot and then go to the tool for corrections. I made some tries and i really cannot understand if the averaged calculations saved on the first mark, because the spot has not not been fixed (in accuracy speaking) and had to reposition it. In one phrase, let's say you need to get an accurate mark, what steps do you follow with the Oregon 450t in order to get advantage to the device capabilities? Looking forward for your help!! Thank you and happy geocaching

Thank you for your replies. I know that iphone has a real GPS receiver but as you say with accuracy of 17-40 meters, is useless for placing a geocache. And yes you have a point for the maps in Cyprus and Greece. I am not sure i can find any reliable ones. In this time of period i do not want to buy any gps device. If i did i would go for an expensive more reliable device of Garmin for example. The thing i wonder is if there is a GPS application for iphone that can help at this point. For Android i know there is one that help you calculate and find the average correct point after a while. As far i have checked all similar apps have the same non accurate accuracy of 17 meters in best case.

Accurate coordinated are very critical to any cache, new or existing. I want to ask if there is a way to accurate calculate them in order to post coordinates WITHOUT a real GPS device. For example i just own only my i-phone 3G device. Can i find the correct coordinates for my new cache? If not, what can i do? Thank you for any advice