Supersportster
Petty Officer 1st Class
- Joined
- Oct 20, 2008
- Messages
- 205
Does anyone use this fishfinder? or have any opinions on it? is getting it for $800 bucks a good deal?
Bird is comparing their CEP numbers (50th percentile) to Garmin's 2dRMS figures (95th percentile) and claiming better accuracy.They also announced an improved GPS antenea: http://www.humminbird.com/High_accuracy_GPS_accessory_pressrelease.aspx
Expression of accuracy
How are the accuracy values represented statistically? The accuracy can be expressed in a manner that describes the 50th percentile (e.g. half the data is better than the stated value, half the data is worse than the stated value). Alternatively, the accuracy may be described at the 95th percentile (95 percent of the data is better than the specification).
CEP (Circular Error Probable) - Values stated as CEP apply to horizontal accuracy only. Half of the data points fall within a circle of this radius centered on truth, half lie outside this circle. (As a nifty approximation, you may multiply CEP by 2.5 to obtain 2dRMS.)
2dRMS - Approximately 95 percent of the data points occur with this distance of truth. It should be expressed clearly whether the accuracy value refers only to horizontal or to both horizontal and vertical.
thanks for the replies!
I think I will wait and see what the price on the new will be...