Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
fish smith, phatjackfarms, Fernando Garcia, rstone21, skolkmeier
105480 Registered Users
Top Posters
TexDawg 85659
hopalong 78097
Pilothawk 74963
JDavis7873® 67382
John175 ® 64470
FattyMcButterpants 60729
Derek 🐝 58068
Tritonman 57517
LoneStarSon® 53073
SkeeterRonnie 52941
facebook
Forum Stats
105480 Members
60 Forums
848714 Topics
12096126 Posts

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

Registered: 06/23/13
Posts: 4085
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 Offline
Outdoorsman

Registered: 04/22/11
Posts: 33
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 Offline
TFF Guru

Registered: 04/08/08
Posts: 12213
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



© 1998-2017 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide