Value of GPS plots, my Roman distribution

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f8met
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Value of GPS plots, my Roman distribution

Post by f8met » Mon Feb 29, 2016 11:18 pm

On the new permission I have been far more disciplined on using the GPS and noting the find with the find spot. I use a Garmin Etrex 30 and I would really recommend getting a GPS, sticking it in your pocket and taking the few seconds to note the find in the waypoint marker.

It has really thrown up an interesting pattern to the finds. I have yet to explore fully the area between the 2 clusters but this allows me to see where I have been and build up the hot spots. The field slopes down from left to right.

Image

I have also found 4 what I believe to be finger rings, 2 definite as 1 is guilded and the other is silver. This shows the distribution of just those from the data. The dark line is an old field and parish boundary which is a noticeable feature in the field.

Image


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Re: Value of GPS plots, my Roman distribution

Post by Fusion » Tue Mar 01, 2016 2:04 am

The 1 metre LIDAR scan of your field would be worth looking at, I think.
Have you checked the calibration of your GPS against a known reference point in your field (eg. a gate, or hedge gap), just to make sure you're not 20 metres out on every point.

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Re: Value of GPS plots, my Roman distribution

Post by lord lovell » Tue Mar 01, 2016 8:00 am

when you look at the hotspots most are falling within a old field system you can see the shape of old field likely removed around 17th century when field became open plan

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Re: Value of GPS plots, my Roman distribution

Post by Dave8472 » Tue Mar 01, 2016 8:48 am

Nice one, well worth doing, I have been doing the same since I started detecting, it looks great when displayed, I have been doing one site for 5 years now. Although no hot spots it shows a higher distribution both on top of the hill, and washed out stuff at the bottom.

On another site a cluster of Victorian penny's, Cyan = Copper Coins, Yellow = Silver Coins
Image4.jpg
Another site with a milled coin hot spot, overlaid on 1940's map, unfortunately there is a placement error on the Google map but I could work out where the spot was between the migrant huts
Image7.jpg
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Re: Value of GPS plots, my Roman distribution

Post by f8met » Tue Mar 01, 2016 9:40 am

I haven't calibrated against a point but I may do that next time out. I can navigate to the waypoint which is pretty spot on. The etrex 30 uses GLONASS satalites so should be slightly more accurate.

Interestingly the dark line was still a field boundary on the 1945 photo on Google earth.
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Re: Value of GPS plots, my Roman distribution

Post by jeff 001 » Tue Mar 01, 2016 5:41 pm

I bought a Etrex 30 recently is there a way of making the batteries last longer , at the minute I'm using Duracell and getting through them quick or I may have a dodgy batch :-/

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Re: Value of GPS plots, my Roman distribution

Post by Whatunearth » Tue Mar 01, 2016 6:32 pm

jeff 001 wrote:I bought a Etrex 30 recently is there a way of making the batteries last longer , at the minute I'm using Duracell and getting through them quick or I may have a dodgy batch :-/
Hi Jeff.
I believe the Etrex 30 should last about 20-25 hours with normal AA, and with Lithium AA batteries can last about 40 odd hours.

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Re: Value of GPS plots, my Roman distribution

Post by jeff 001 » Tue Mar 01, 2016 7:03 pm

Hi Greg I'll try the lithium batteries , still not got to grips with this gps but it looks a good piece of kit next time we're out you may be able to help me out with it ::g

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Re: Value of GPS plots, my Roman distribution

Post by Steve_T » Tue Mar 01, 2016 7:43 pm

jeff 001

I did a guide to set up and use the etrex 10, I guess would be similar to the etrex 30
if this helps?? its in the link, or I could PM it to you.
http://www.metaldetectingforum.co.uk/vi ... 20#p759982" onclick="window.open(this.href);return false;

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Re: Value of GPS plots, my Roman distribution

Post by Whatunearth » Tue Mar 01, 2016 7:48 pm

jeff 001 wrote:Hi Greg I'll try the lithium batteries , still not got to grips with this gps but it looks a good piece of kit next time we're out you may be able to help me out with it ::g
Ok mate no problem ::g
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Re: Value of GPS plots, my Roman distribution

Post by jeff 001 » Tue Mar 01, 2016 8:05 pm

Thanks Steve I'll have a look ::g sorry to hyjack your post f8met :D

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Re: Value of GPS plots, my Roman distribution

Post by f8met » Tue Mar 01, 2016 9:31 pm

No problem. I was going to say I could easily do 5-6 trips on a set of batteries but when you get a low warning it goes quickly.

Hardest part is Google earth. Still trying to get it to work the way I want it.
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Re: Value of GPS plots, my Roman distribution

Post by Jungle » Mon Aug 29, 2016 8:00 pm

It might take a couple of seasons to collect data but it does help. I had spare 30 minutes, went to a field in my village where I'd found some hammered in the previous year, GPS guided me to hot spot and another cut quarter came up. In my (maturing) mind the hot spot was 20m away.
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Re: Value of GPS plots, my Roman distribution

Post by f8met » Tue Aug 30, 2016 9:57 am

In my new field of dreams where the gold hammered came out it appears from my latest plots that it may have been a footpath from the straight line of the finds. I was trying to find where it went in the next field with no sucesss.
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