Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
atm80mta, Kaleb Stewart, Eagle anglers, huntin_the_thump, Redfishcharterco
105904 Registered Users
Top Posters
TexDawg 86322
hopalong 78548
Pilothawk 75157
JDavis7873® 67382
John175 ® 65056
FattyMcButterpants 60793
Derek 🐝 58499
Tritonman 57642
LoneStarSon® 53405
SkeeterRonnie 53007
facebook
Forum Stats
105904 Members
60 Forums
854745 Topics
12170452 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: 4192
Loc: Above ground
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: 12672
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