| Author |
Message |
 Topic: Using sat nav with road atlas |
harryparkes
Replies: 4
Views: 1833
|
 Forum: Beginners GPS Lounge Posted: Sun Dec 27, 2009 6:23 pm Subject: Using sat nav with road atlas |
| The number and letter marking are for Philips own grid for finding towns. The small figures may well be OS reference numbers. Many road maps use the OS grid. I don't know about the Philips one. Will y ... |
| Topic: I would like to Survey my Property |
harryparkes
Replies: 11
Views: 3993
|
Forum: Beginners GPS Lounge Posted: Fri Oct 19, 2007 6:52 pm Subject: I would like to Survey my Property |
Hi,
Reading this discussion caused me to look at some analysis of GPS output I did some time ago. Orginally, I wanted to see if there was any improvement in accuracy from my Garmin Geko if I turned ... |
| Topic: Total beginner - Lat/Long vs. O.S. Map References |
harryparkes
Replies: 6
Views: 2926
|
Forum: Beginners GPS Lounge Posted: Wed Oct 10, 2007 5:13 pm Subject: Total beginner - Lat/Long vs. O.S. Map References |
Hi,
The conversion given in the previous reply converts OSGB36 Lat/Long to NGR. My guess is that your GPS gives WGS84 Lat/Long. If so, you will have an error of about 100 metres if you use this con ... |
| Topic: Help with Garmin Etrex connecting to a Laptop, Functionality |
harryparkes
Replies: 1
Views: 1003
|
Forum: Beginners GPS Lounge Posted: Sun Sep 16, 2007 12:59 pm Subject: Help with Garmin Etrex connecting to a Laptop, Functionality |
Hi,
There are a number of program for doing what you want. My own preference is GPSU from www.gpsu.co.uk
You can import track points and waypoints via the serial lead. Remember to set the interface ... |
| Topic: Long/Lat to graph/map |
harryparkes
Replies: 7
Views: 3644
|
Forum: Advanced GPS Lounge Posted: Sun Sep 17, 2006 8:29 pm Subject: Long/Lat to graph/map |
Not only late but wrong! I should have said mutiply.
Harry |
| Topic: Long/Lat to graph/map |
harryparkes
Replies: 7
Views: 3644
|
Forum: Advanced GPS Lounge Posted: Sun Sep 17, 2006 8:22 pm Subject: Long/Lat to graph/map |
Hi,
A bit late in replying.
To get the correct aspect ratio divide the longitudinal difference by the cosine of the mid-latitude. So for lat 50 deg the factor is cos 50 = 0.64279.
Harry |
| |
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