SailNet Community - View Single Post - GPS Accuracy - how much is actually needed
View Single Post
post #21 of Old 03-05-2014
Senior Member
TakeFive's Avatar
Join Date: Oct 2009
Location: Swarthmore, PA
Posts: 3,778
Thanks: 12
Thanked 98 Times in 87 Posts
Rep Power: 8
Re: GPS Accuracy - how much is actually needed

No matter how accurate your GPS lon/lat fix, it will never improve the accuracy of the underlying chart that you use. In some areas (like my home port) that charts seem to be highly accurate. In other areas (BVI) the charts can be off by as much as 0.5 nm, depending on which "chip" you purchase or charts you select (NOAA inaccurate, NGA accurate). I've posted many demonstrations of this before, but don't have time to hunt them down right now.

Originally Posted by Alex W View Post
...For about the same price as the external NMEA 2000 GPS sensor you could buy a tablet that would give you a remote display from the A67 that is usable below decks. Any Android or iOS tablet will do it.
...or smartphone or Win8 tablet.

FYI, the Lenovo Miix 8" tablet that I have purchased (with internal GPS chip) has been seeing periodic price drops to $200 on Amazon. Just install OpenCPN, download NOAA's charts (preferably onto a 32GB microSD card), and install/configure GeolocationTCP, and you've got a really nice portable chartplotter for US use:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2001 Catalina 34MkII Breakin' Away (at Rock Hall Landing Marina)
PO of 1998 Catalina 250WK Take Five (new owners relocated to Baltimore's Inner Harbor)
1991 17' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)
TakeFive is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome