Mapping Mountains – Trimble Surveys – Hirddywel

 

08.05.26  Wenallt (SO 036 712)

The summit of Wenallt (SO 036 712)

Forested summits are not my favourites.  This isn’t surprising as many prove formidable to reach their highest point, entailing pathless slogs through enclosed conifers with skin ripping brambles and other unsavoury undergrowth encountered.  There are also some summits that resemble an assault course due to felled wind blown trees when upward progress seems impossible.  However, on occasion even these can give an unusual feeling of fulfillment if the summit is eventually reached.

Therefore, it wasn’t surprising that I had left Wenallt as my last Pedwar in this area of Wales, as although inviting tracks are shown on the Ordnance Survey 1:25,000 Explorer map, the hill looked a mass of uninviting conifer trees.

With a planned morning visit to the Powys archive at Llandod and knowing that this was my last Pedwar in the Hirddywel group of hills, Aled was enthusiastic for us to visit the hill in the afternoon.  The forecast wasn’t promising with heavy localised showers breaking out after midday, and as we left the archive at its 12.30pm closing time the clouds were massing with the prospect of those showers soon materialising.

It’s only a short drive from Llandod to Abaty Cwm-hir and we were soon parked just off the narrow road at the start of a forest rack.  A metal gate barred further vehicle access, and upon inspection we found this locked, so driving on the forest track to gain height was now out of the question.  Therefore, once walking boots were donned we set off up the wide expanse of gravelled track that led first northward away from the summit before swinging westward back toward it. 

A convenient parking place for the ascent of Wenallt

The early afternoon was slightly muggy and as my younger companion seemed to manage the uphill with hardly a breath out of place, I started to sweat and needed a few rests to try and compose my heartbeat and steady its increased thudding. 

The narrower track leading to the turning place

It was a tranquil scene in the forest, with rising mature conifers spreading toward the sky and occasional birdsong wafting from their heights.  The main forest track soon bisected with the branch we wanted now narrowing and heading south.  This culminated in a grassed area where forestry vehicles could turn.  We now had two options for further progress; one grassed track leading up to two felled trees and a slightly lower path that was narrower and lost a little height.  We opted for the higher one and soon clambered over the trees.  On our descent we headed through the mature forest to join the lower narrower path, and therefore bi-passing the two obstacles. 

The greens and blues of summer

Approaching the grassed turning circle

Having clambered over the two trees we were soon on a delightful path that meandered through the wood, always claiming height on a thankfully steady gradient.  Such paths are seldom found in conifer forests.  The path forever weaved its way up through the wood, with dappled sunlight occasionally casting through the trees, adding a welcome highlight of colour to the scene. 

A direct approach toward the summit looked horrendous

The green track beyond the turning circle with the two fallen trees ahead

Thankfully the forecast showers never materialised in this part of the country, with only a few spots of rain appearing as our route through the trees reached the upper broad easterly ridge of the hill.  Here we swung rightward with the path continuing its delightful meander through the trees. 

On the path that meandered through the wood

Close to the summit another large fallen tree meant a slight diversion was needed, but such occurrences were rare and the ones encountered never difficult to overcome.  Aled reached the summit before me; this comprises a small outcrop with vegetation overflowing from its upper reaches.  The outcrop is easy to get up with only thin branches from enclosing trees as hindrance. 

On the broad easterly ridge leading toward the summit

I followed and with Aled vacating the small area of the high point I soon stood on the summit.  Making our way back down we examined the outcrop and pondered what a lovely ridge walk this would have been prior to the influx of conifers, and what a shame it was that those planting the forestry had no foresight to leave the summit area free of trees. 

Aled on the summit of Wenallt

The outcrop that constitutes the summit of Wenallt

Our route proved ideal, with the upper part of an approach from the west looking horrendous as a jumble of trees barred any passage through.  All that remained was to retrace our steps down the broad easterly ridge before swinging north on our delightful inward path, with Aled leading the way through the mature trees to gain the lower path close to the turning place so we could avoid the two fallen trees clambered over on our ascent.  We were back at the car by 3.15pm, with the walk having taken 1hr 50min.

Another Pedwar visited taking my total to 364 hills, with 448 hills in all it would be tempting to concentrate on the remainder, but my baggng mentality has changed over recent years and I gain almost as much pleasure from repeat ascents as I do from visiting new hills, so for me I doubt I’ll finish this list. 

   

Survey Result:

 

Wenallt

Summit Height:  471.9m (LIDAR) 

Summit Grid Reference:  SO 03697 71231 (LIDAR) 

Bwlch Height:  372.7m (LIDAR)

Bwlch Grid Reference:  SO 03481 72058 (LIDAR)

Drop:  99.2m (LIDAR)

Dominance:  21.01% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet

Mapping Mountains – Trimble Surveys – Hirddywel

 

19.11.25  Gorn Hill (SN 968 844) 

Gorn Hill (SN 968 844)

I’d only visited Gorn Hill once before in January 2003 and a second visit was long overdue, especially as Eryl and I had mentioned this hill for a small walk on a number of occasions over recent years and today with fairly settled weather, albeit with a chilled easterly breeze, proved as good a day as any to meet and venture forth to the Gorn.  We also had the advantage of Rita offering to drop us off at the top of the road which leads to the footpath for the usual ascent of the hill.

A few breeze blown sleety drops of rain skidded across the sky as we started our walk from the top of the road following the lane leading to Gorn Farm.  These were being blown in on an easterly breeze and the hills adjoined to Pegwn Mawr that from our vantage point were now behind us, were adorned with the first snows of winter with their prominent wind turbines marching across their upper ridge. 

Dusting of snow on the Pegwn Mawr hills

There’s a beauty to fields and the patterns they create, even those that are now just greened and not meadowed.  Their boundaries create these patterns across the land, with hedges standing out compared to those that are just fenced.  From where we now were, the foreground of these patch-worked fields all emerald green in low early winter light fed the eye toward distant gently rising hills, some with a dusting of snow crowning their tops.  Overhead a Red Kite majestically played in the breeze, its bronzed colour standing out as flashes of sunlight caught its wing tips.  It felt good to be out. 

Patch-worked fields

The footpath led past Gorn Farm where a small herd of black cattle met us in a field.  They ran this way and that, keeping their distance but always inquisitive.  Flashes of sunlight added depth to the landscape, accentuating the smooth curved contours of near fields, with snow-capped hills adding perspective of height to the scene.  Away to our north the pyramidal profile of Moel y Golfa and the Breiddin stood out on the horizon, with green fields and speckled patches of white sheep as foreground.  Even relatively low heighted hills can give excellent views and especially so in winter light. 

The distant Breiddin on the right

From this approach it’s an easy route to the summit of Gorn Hill with good signposting and gates indicating the way.  The high point is close to the public footpath, and easy to reach.  The summit has two options vying for high point, with LIDAR confirming the highest.  For me this was another day without taking summit data with the Trimble, which is becoming the norm, this is partly due to the inordinate amount of time that even one data set can incur and having previously LIDARed the hill, this would suffice for its numerical data. 

Eryl heading toward the summit of Gorn Hill

I soon joined Eryl on the summit having used the Trimble as a hand-help GPS device to indicate what field the summit was in and then what out of the two options the high point of the hill was.  We stayed on top for a while, taking a number of photos and chatting.  It was good to be out on a hill with Eryl, something that has been neglected for a number of years. 

The summit of Gorn Hill

From the summit we backtracked to the gate that had given us access into the high field and joined up with the public footpath heading down the hill toward the easterly realms of Llanidloes.  Our continued route down was now on a steepening field and as we lost height the town was edged in sunlight nestled in its low lying plain and formed a perfect foreground with distant snow-capped hills beyond. 

Looking down on Llanidloes

We stopped on a number of occasions on our decent, and chatted about all manner of things, many of times now gone and those distant hills never to be visited again.  This is one of the customs of increasing age where memory fulfills what was once expectation.

Our route took us onto the Gorn Lane and from here it was only a left turn and a minute or so’s walk to where Eryl and Rita live.  A cup of tea and delicious meal was soon on the table; a perfect end to a very fulfilling couple of hours on the hill. 

   

Survey Result: 

 

Gorn Hill 

Summit Height:  326.4m (LIDAR)  

Summit Grid Reference:  SN 96895 84496 (LIDAR) (summit relocation)

Bwlch Height:  278.1m (LIDAR)

Bwlch Grid Reference:  SN 97747 83851 & SN 97747 83848 (LIDAR) 

Drop:  48.3m (LIDAR)

Dominance:  14.80% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet

Mapping Mountains – Trimble Surveys – Hirddywel

 

07.05.21  Domen Ddu (SO 016 782), Pt. 540.0m (SO 019 787), Crugyn Llwyd (SO 024 796), Pegwn Mawr (SO 023 812) and Pegwn Bach (SO 017 805) 

Crugyn Llwyd (SO 024 796)

Having asked permission to park my car at the entrance to Grach farm I was walking along the continuation of the narrow lane that heads south by just past 8.00am.  My plan for the day was to visit and survey the hills on the southerly part of the main Pegwn Mawr ridge.  I’d visited Domen Ddu and Crugyn Fawr on two previous occasions, but along with these hills I wanted to survey Pegwn Bach; as its name implies a lower and adjacent hill connected to Pegwn Mawr. 

There was a slight chill in the air as I set off, with low light accentuating the rippled shadows moving across the land, pushed along by a wakening breeze.  The forecast gave generally dry conditions with an outside chance of an early afternoon shower materialising. 

Early morning heading toward the southerly part of the main Pegwn Mawr ridge

The main ridge of Pegwn Mawr is now dominated by its wind farm.  I visited this hill before the turbines were installed and remember it being a wild moorland hill.  Now the access tracks lessen this effect, but it is still a good hill to visit, and although I had no definite plan to head as far north as its summit tumulus, it was relatively near Pegwn Bach and especially so as the latter has two potential points for its bwlch and the furthest north of these was literally just below the summit dome of Pegwn Mawr. 

I soon left the narrow lane and continued on a track and again left this after only a short distance to climb a steep closely cropped grass slope upward to a fence.  The grazing fields now relented and moorland took over.  Shortly after crossing the fence I followed a vehicle track contouring upward to the edge of forestry which is situated close to a bwlch that I later surveyed.  But my first objective was the summit of Domen Ddu; a hill that I had surveyed on two previous occasions, the first in September 2002 when assisted by Eryl Selly and Steven Hughes we surveyed the hill for drop using my old basic levelling staff, resulting in 81ft / 24.7m.  The second in June 2008 with John Barnard, Graham Jackson and David Purchase when we line surveyed the hill resulting in 24.3m of drop.  Now I wanted to put an accurate height to its summit and also, if time and inclination was forthcoming, its bwlch, as it is always good to compare data produced by the Trimble GeoXH 6000 against other surveying methods. 

By the time I neared the summit tumulus on Domen Ddu cloud had built up, therefore the land was cast in patches of direct sunlight and shade and when the sun enhanced the colour I took every opportunity to take photographs and approaching the summit tumulus the greens, beiges and rusted fawns of moor grass swept toward the upper part of the hill.  At times like this, when on my own and the beauty of upland landscape is fleetingly enhanced by direct sunlight, it still has the power to stop me in my tracks and just look and take in the scene. 

Approaching the summit tumulus atop Domen Ddu

I was soon on top of the tumulus and set the Trimble up atop my rucksack with its internal antenna aligned with the highest part of the hill, and once the measurement offset was taken I set it to gather data and stood on the periphery of the tumulus looking north to the other hills I planned to visit. 

The onward route with Pegwn Bach on the left and Crugyn Llwyn central right

Gathering data at the summit of Domen Ddu

Having packed the Trimble away I headed back toward the corner of forestry and then followed reed grass upward to where a bwlch lay.  This bwlch connected to a small prominence hill just to its north.  I took two data sets, each on the valley to valley traverse before heading to its summit.  The high point was relatively easy to identify and consisted of a patch of grass amongst copious amounts of heather and moor grass. 

This summit was an excellent vantage point to look north toward the remaining hills to visit and between it and the summit of my next hill; Crugyn Llwyd was a morass of bleached moor and no doubt bog.  I hoped a semblance of a path existed otherwise it would prove a wet and unrelenting route onward.  Thankfully a vehicle track on the moor contoured around the north-easterly flank and this would at least help me on my way.  Once on it, it led all the way over the connecting bwlch and up toward the summit of Crugyn Llwyd. 

As Domen Ddu had previously been line surveyed I had no definite plan to Trimble its bwlch, but I had noted the ten figure grid reference for it.  However, although the bwlch could have been positioned in a desolate quagmire it was conveniently placed at the track and even without the aid of the ten figure grid reference its position would have been easy to identify.  As I was now there I surveyed it with the Trimble.  As the equipment gathered its allotted data I sat on the edge of the track and watched a Red Kite circle overhead.  As it did so, its head moved leftward looking straight down at me.  I watched it for a number of minutes as it glided the air, circling as it did so; a wonderful sight. 

Gathering data at the bwlch of Domen Ddu

I left the continuation of the track as it was waterlogged from recent heavy rain that had swept the blue skies away over the last few days, and followed a fence line up the southern part of Crugyn Llwyd.  This hill was central on my day’s route and gave good extensive views.  Its high point was easy to identify and after surveying it I continued heading north. 

Pegwn Bach from the summit of Crugyn Llwyd

Gathering data at the summit of Crugyn Llwyd

The continuation of the route from the summit of Crugyn Llwyd was now on moor grass.  I picked up an occasion sheep track on the moor which headed down toward its connecting bwlch and passed over a green track crossing from east to west on my way.  Later in the day I would use this as my descent route back to Grach farm and my car.  But now I had a formidable bwlch to tackle.  It looked horrendous.  It extended across the land in front of me with high tussocks, reed grass and what turned out to be a water laden bog.  I wandered its realm for a number of minutes, balancing from one wobbly tussock to another, always aiming to where I envisaged the valley to valley traverse met with that of the hill to hill traverse.  My chosen spot could easily be 100 – 200 metres out in placement.  However, as I was there I set the Trimble up and gathered the allotted five minutes of data.  During data collection I sat on a tussock which slowly collapsed with the bog progressively making me wetter and wetter. 

Approaching the bwlch of Crugyn Llwyd with Pegwn Mawr in the background

Gathering data at the bwlch of Crugyn Llwyd

Leaving the bog I made my way up toward one of the bylchau that connect with Pegwn Bach.  This small prominence hill has two potential positions for its bwlch.  My initial plan was just to survey one, but I knew that in all likelihood I would survey the two.  I also knew that as the second of these two positions was just below the summit of Pegwn Mawr, I would probably also visit this summit. 

The Trimble was set up beside a small puddle of a pool at the first bwlch and on the moor for the second, and leaving the summit of Pegwn Bach for my return I then continued toward the top of Pegwn Mawr. 

As my hill life is now mainly dictated by surveying I have learned that preparation pays dividends and therefore prior to each walk I analyse available LIDAR and make a note of all relevant grid references.  This takes time, but also saves it when on the hill.  However, I always gain pleasure from unplanned visits and as Pegwn Mawr was not planned for today, I enjoyed heading up to its summit.  This brought back so many memories from my first visit prior to the wind farm being built, to when John, Graham and I surveyed the hill for summit position, to my last visit three years ago with Aled when we surveyed the hill with the Trimble.  As I was now on the summit I set the Trimble up and gathered another summit data set. 

Gathering data at the summit of Pegwn Mawr

Although the equipment was initially placed facing south where the majority of satellites are positioned, after ten minutes of waiting the accuracy level only attained 0.15m, therefore I re-positioned it facing north and within a couple of minutes the 0.1m accuracy level before data should be logged appeared on the screen and I pressed ‘Log’ and stood below it whilst it quietly beeped away gathering data. 

The view north from the summit of Pegwn Mawr

Having said my goodbye’s to the summit of Pegwn Mawr I retraced my inward route back to the first potential bwlch position of Pegwn Bach and continued on a sheep path leading toward its summit.  This is crowned by another ancient tumulus, which is grassed with a prominent cairn positioned on it.  The Trimble was soon set up gathering its eleventh and last data set of the day. 

Gathering data at the summit of Pegwn Bach

It was a relatively easy descent from this hill toward my awaiting car.  One thing I did not want to do was retrace my route back over the connecting bwlch with Crugyn Llwyd.  My eventual route of descent lay on the southern side of a steep stream valley that headed down toward Grach farm.  Leaving the summit of Pegwn Bach I took a direct line toward the summit of Domen Ddu which looked back across the intervening land and then followed a green track of sorts as it headed toward an old rusted gate which gave access to the other side of the stream. 

Nearing Grach farm

Beyond the stream I connected with the descending green track which I had walked over when heading down to the bog laden bwlch of Crugyn Llwyd.  The green track proved a delightful route down, leading me on a steady and comfortable gradient with the early afternoon sun bringing warmth replacing the chilled air from early morning. 

 

Survey Result:

 

Domen Ddu  

Summit Height:  551.8m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SO 01690 78262 (Trimble GeoXH 6000)

Bwlch Height:  527.6m (converted to OSGM15, Trimble GeoXH 6000) (and also relative to 24.262m line survey for drop)

Bwlch Grid Reference:  SO 02166 79025 (Trimble GeoXH 6000)

Drop:  24.3m (line survey)

Dominance:  4.40% (Trimble GeoXH 6000 summit and line survey for drop)

 

 

Pt. 540.0m  

Summit Height:  540.0m (converted to OSGM15)

Summit Grid Reference:  SO 01946 78794

Bwlch Height:  528.0m (converted to OSGM15)

Bwlch Grid Reference:  SO 01979 78656

Drop:  12.0m

Dominance:  2.23%

 

 

Crugyn Llwyd  

Summit Height:  570.0m (converted to OSGM15)

Summit Grid Reference:  SO 02407 79622

Bwlch Height:  531.2m (converted to OSGM15)

Bwlch Grid Reference:  SO 02308 80404

Drop:  38.8m

Dominance:  6.81%

 

 

Pegwn Mawr

Summit Height:  585.3m (converted to OSGM15, average of two Trimble GeoXH 6000 surveys)

Summit Grid Reference:  SO 02391 81239

Bwlch Height:  285.9m (converted to OSGM15, from previous Trimble GeoXH 6000 survey, natural bwlch)

Bwlch Height:  283.8m (converted to OSGM15, from previous Trimble GeoXH 6000 survey, disused rail cutting)

Bwlch Grid Reference:  SN 92693 80074 (from previous Trimble GeoXH 6000 survey, natural bwlch)

Bwlch Grid Reference:  SN 92601 80035 (from previous Trimble GeoXH 6000 survey, disused rail cutting)

Drop:  299.3m (natural bwlch)

Drop:  301.5m (disused rail cutting bwlch)

Dominance:  51.14% (natural bwlch)

Dominance:  51.51% (disused rail cutting bwlch)

 

 

Pegwn Bach  

Summit Height:  567.5m (converted to OSGM15)

Summit Grid Reference:  SO 01766 80573

Bwlch Height:  557.4m (converted to OSGM15)

Bwlch Grid Reference:  SO 01944 80714

Drop:  10.1m

Dominance:  1.78%

 

 

For details on the 1^st summit survey of Pegwn Mawr

For details on the bwlch survey of Pegwn Mawr

For an in-depth examination of the bylchau of Pegwn Mawr and Great Rhos

 

 

For further details please consult the Trimble Survey Spreadsheet

 

Mapping Mountains – Trimble Surveys – Hirddywel

 

18.10.20  Y Foel (SO 018 840) and Allt y Moch (SO 022 849) 

Y Foel (SO 018 840)

I’d visited Allt y Moch as one of three walks after lock-down restrictions were lifted in early July.  I’d previously surveyed the hill with my old basic levelling staff as having approximately 29.4m of drop; and as the Trimble result came to 29.98m of drop it was time to re-visit and concentrate on the area of the hill’s bwlch and take further readings from its summit. 

When the Trimble result was sent to Aled he suggested we could combine the re-survey with a visit to Y Foel which is positioned across the intervening small stream valley, with each hill visited from the convenience of a relatively high parking place as a there and back walk. 

The day’s forecast was relatively good with dry conditions and little breeze, and although the day proved to have grey skies the cloud base was above the tops.  We met in Caersŵs and I drove the remaining distance to the hill and parked on a grass verge beside the track that leads down to the old farm house of Foel-Fawr. 

Heading toward Y Foel

Y Foel is a great lump of a forested hill which if not for the conifers would no doubt give excellent views.  Reaching the old farm house which is now no more than a ruin we headed on the continuation of the track in to the conifers.  From the track there are a number of options to head up on forest breaks toward a narrow path that follows this hill’s north-westerly ridge all the way to the summit.  This is the route that Charlie Leventon and I used on my only previous ascent in September 2011. 

We followed one of the rides steeply up to a forest break and after a quick investigation found the ridge path.  This simplified matters as all we now had to do was follow it up until the summit was reached. 

The forest break leading toward the ridge path

Walking on a path through a forest can have its own beauty, in some ways this is similar to walking in mist as few views can be seen and one’s world is suddenly condensed to the immediate surrounds.  It was no different today and as height was gained we started to look out for the small cairn beside the path that constitutes the summit position. 

The ridge path leading toward the summit

We reached what we thought was the summit, but could not see the cairn, therefore we continued in the same direction to make sure that all ground now went downhill, it did, so we headed back to the high part of the hill.  We chose a spot for Trimble placement and before setting it up to gather data I used it as a hand-held device and headed in to the trees to find the spot that LIDAR gives for the summit.  The LIDAR placement was about 15 metres in to the conifers and after assessing the ground I headed back to our preferred high point. 

As I took the measurement offset between the internal antenna and the ground at the base the bottom of the tape hit rock.  This proved to be the small cairn which is now covered in moss and hardly recognisable from what it looked like nine years ago. 

Gathering data at the summit of Y Foel

Prior to setting the Trimble up we headed through one or two conifers to the steep southern flank of the hill which is clear of trees, and sat looking out across the Nant Glyn and beyond to higher hills.  Once back in the trees I set the Trimble to gather data. 

Out of the conifers, the view across the Nant Glyn

Once the allotted data were gathered and stored were reversed our inward route and headed back to where my car was parked, here we met the couple who live at Borth; the small holding just down the narrow lane.  One was sitting on a horse and the other on a quad bike and with their dog happily following they were out for the day.  We chatted for a number of minutes before they headed up the lane. 

Allt yr Moch (SO 022 849)

We now wanted to visit Allt y Moch and followed a green track on the hill’s southern flank which led to the gate at the bwlch.  We knew from the data sets taken on my previous visit where the area of the bwlch is positioned.  However, this is not difficult to ascertain just by eye. 

I’d brought flags in case these were needed and we spent a few minutes deciding how many data sets were to be taken and from where.  Having assessed the lay of land we opted for four data sets, all relatively close together and concentrating on land just to the north of the fence that crosses the bwlch on a hill to hill direction. 

Whilst waiting for the Trimble to achieve its 0.1m accuracy level before data should be logged the conditions progressively got colder, as by now a slight breeze had descended across the bwlch.  However, we persevered and eventually left the bwlch having taken the four data sets that we wanted. 

Gathering data at the bwlch of Allt y Moch

A greened vehicle track leads from the bwlch toward the summit of Allt y Moch and we followed this up to its high point.  On my last visit I’d taken four data sets from the area of the summit with three of these concentrating on its higher ground, and once we had assessed the lay of land and positioned a number of flags, each inserted in the ground to the same level, the flags were then Abneyed and we removed those that were lower, leaving two remaining. 

Gathering data at the summit of Allt y Moch

During data collection we sat on the northern side of the hill out of the breeze and enjoyed the view.  Once the second data set was gathered and stored, I closed the equipment down, packed it away and we headed down following our inward route back to the awaiting car.   

 

Survey Result: 

 

Y Foel  

Summit Height:  435.8m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SO 01864 84066 (Trimble GeoXH 6000)

Bwlch Height:  319m (spot height)

Bwlch Grid Reference:  SO 02299 84267 (spot height)

Drop:  117m (Trimble GeoXH 6000 summit and spot height bwlch)

Dominance:  26.81% (Trimble GeoXH 6000 summit and spot height bwlch)

 

 

Allt y Moch  

Summit Height:  419.7m (converted to OSGM15, from previous Trimble GeoXH 6000 survey)

Summit Grid Reference:  SO 02202 84938 (from previous Trimble GeoXH 6000 survey)

Bwlch Height:  389.6m (converted to OSGM15)

Bwlch Grid Reference:  SO 02366 84827

Drop:  30.1m (400m Sub-Pedwar reclassified to Pedwar)

Dominance:  7.17%

 

 

For details on the first Trimble GeoXH 6000 survey of this hill

For further details please consult the Trimble Survey Spreadsheet