Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Gary D Watters, Don Dison, loop, Gadawgs, urosenara
102734 Registered Users
Top Posters
TexDawg 82894
hopalong 74407
Pilothawk 73446
JDavis7873® 67377
FattyMcButterpants 60518
John175 ® 59917
Tritonman 56836
Derek 56445
SkeeterRonnie 52463
LoneStarSon® 52225
facebook
Forum Stats
102734 Members
61 Forums
859343 Topics
11273825 Posts

Max Online: 36273 @ 01/23/13 02:34 PM
Topic Options
#11800830 - 08/28/16 06:31 AM Gps coordinates and navionics
Bugzout10 Online   content
TFF Team Angler

Registered: 06/23/13
Posts: 3547
Loc: Weatherford Tx
Trying to load some coordinates on the graph and noticed they're off a considerable amount has anyone else had this problem? I've converted the coordinates in the correct form checked them on google maps and they're correct it's only when I use navionics that they're off

Top
#11800843 - 08/28/16 07:08 AM Re: Gps coordinates and navionics [Re: Bugzout10]
Bandit 53 Online   content
Outdoorsman

Registered: 04/22/11
Posts: 24
You have to choose the proper format in your unit for your waypoints. Most folk use degrees, decimal min or deg min sec.

Top
#11800929 - 08/28/16 08:30 AM Re: Gps coordinates and navionics [Re: Bugzout10]
collincountytx Online   content
TFF Guru

Registered: 04/08/08
Posts: 10068
Loc: Dallas, TX
Double check the original waypoint unit format.

For example:
The Martin's Maps use NAD27 format
Most digital chart plotters use WGS84

The units look identical degrees, minutes, seconds. However, the NAD27 units are calculated by using triangulation from Meades Ranch, Kansas. The WGS84 units are calculated on an ellipsoid grid of the earth from space. Thus, the NAD27 locations can be off by as much as 200 meters compared to WGS84

There are lots of online coordinate conversion calculators

Here's a good link for you

Map Datums

online calculator link
online GPS converter
_________________________

Top



© 1998-2016 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide