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Hi.Can anyone recommend a Sat Nav that has an Ordnance Survey grid reference search facility.The one i have at present just does Post Codes but not much good for finding farm CL,s with a limited address.Any help would be appreciated.
regards Rob.
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I have a Garmin nuvi 660 which has GPS co-ordinates and a format called British National Grid, but the format is different to an OS grid ref. There are three other GPS formats avialable. Not sure if this will help.
Regards.
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I have a Garmin nuvi 660 which has GPS co-ordinates and a format called British National Grid, but the format is different to an OS grid ref. There are three other GPS formats avialable. Not sure if this will help.
Regards.
This may be the answer to my question. I have been putting in lat and long into Google earth in the format that they appear in the C&CC book, (say 52.2278 -1.4471) but the location is often different, usually by about 1/2 mile or so, to the grid ref on OS maps. The post code usually brings up a third location not far away.
Can anyone offer another explanation?
Tco
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I have also found that the C&CC lat & long co-ords often do not correctly locate the sites in GE.
The advantage of GE is that you can often locate the site by scanning around the satellite image.
I'm fairly certain the problem is that the lat & long provided for some of the C&CC sites is inaccurate. I have recently transferred the campingcar-infos aires sites to GE. They distinguish between sites for which the GPS data has been verified and those that have not. All of the verified sites that I have checked in high resolution areas are spot on.
jem
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The inaccuracies you mention (i.e "half-a-mile out") are probably caused by the different geodetic datums used by the map maker or Google maps and the GPS receiver in use.
The most common datum is WGS-84 but there are hundreds of others in use around the world. I believe for land maps in the UK the datum is OSGB. Possibly, with Google Earth being an American company they use yet another datum, but I speculate. As an ocean navigator, I have to synchronize my chart plotter (or paper chart) with my GPS by telling the GPS what datum the chart was mapped with. Mostly commonly these days it is WGS-84 but on older charts it can be WGS-72. If not synchronized, inaccuracies at way-points or destinations can be of the magnitude or greater than you mention.
I have a Garmin 660 for land use in my car and MH and have used many other makes of satnavs. To the best of my knowledge none of these devices allows the user to nominate a particular geodetic datum, hence the slight inaccuracies.
PP
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That looks like a PC based system you use. That would certainly overcome the problem at hand. However, unless I'm mistaken, the self contained sat-navs most people in-car use won't have this facility.
For my next foray to the continent, I intend to equip my laptop with a nav. software programme and GPS antenna similar to yours.
PP
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That looks like a PC based system you use. That would certainly overcome the problem at hand. However, unless I'm mistaken, the self contained sat-navs most people in-car use won't have this facility.
Hi PP
Yes that screen shot was from my PC but Memory Map runs on my Pocket PC too... a Mio 168 which has a built in GPS reciever. It also runs Tomtom but not simultaneously. I have a windscreen mount for use in the van. The only rider I would add is that using a Pocket PC does require quite some knowledge of the "how to" when it comes to dealing with the software and the hardware. It is more complicated to use and set up than a dedicated unit.
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