Showing posts with label Y Trechol - Hills Surveyed. Show all posts
Showing posts with label Y Trechol - Hills Surveyed. Show all posts

Sunday, 24 August 2025

Mapping Mountains – Trimble Surveys – Garn Fawr


17.06.25  Carn Llidi (SM 737 280) 

Carn Llidi (SM 737 280)

Carn Llidi is rock strewn in its higher reaches and protected from any off-path ascent by copious amounts of tough undergrowth.  The hill is positioned north-west of Tyddewi (St David’s) which purports to be the smallest city in the British Isles.  It looks out over a jagged coastline which the Pembrokeshire Coast Path follows.  Although the hills hereabouts are good, it is the coastal path that is the highlight. 

Pentre Ifan

We were based at Caerfai for a few days, which is just to the south and easy walking distance from Tyddewi.  On our way to Caerfai we visited Pentre Ifan, which is one of Wales’ most impressive ancient burial sites with its upper monolith delicately balanced. 

Inside the chapel at St Non's

The coastal path was next to where we stayed; we walked to Solfach (Solva) and bussed it back to the city and on another day headed to the delights of St Non’s; a Catholic retreat beside the coast path. 

The cathedral at Tyddewi

Whilst at Tyddewi the first Welsh Bible was transferred to the cathedral.  It was translated by Bishop William Morgan and published in 1588.  It had never been on public display and along with the first Bible published in Irish was now at the cathedral.  Whilst visiting to see this Bible I stood and listened to four elderly ladies talking amongst themselves in Welsh, whilst pointing at the book housed in its display cabinet.  I found this scene rather emotional as this book played a crucial role in preserving the Welsh language and over 430 years later this small group of neatly dressed women were a testament to the importance of this book and the strength of the language. 

The first Welsh Bible

As well as hills, coastal walks and the cathedral, the land surrounding Twddewi also looks west to a series of islands dominated by Ynys Dewi (Ramsey), which I had visited and surveyed its three P30 hills in May 2016.  However, there are many more islands scattered beyond Ynys Dewi with the main grouping being Emsger, Carreg Rhoson and North Bishop.  And when at Caerfai we took two boat trips; the first around Ynys Dewi and the second a magical evening trip to North Bishop. 

On the coastal path

However stunningly beautiful the coastal path and islands are, and however interesting and historically significant the cathedral is, we also needed a hill to visit.  The one that looked the most impressive was Carn Llidi.  I contemplated bringing the Trimble to survey its summit, but the prospect of carrying the equipment for six days with only one hill to visit was not appealing and therefore the Trimble remained at home and LIDAR would have to suffice for the numerical details of this hill. 

The highest of the chain of islands known as North Bishop

We parked on a grass verge on the B4583 road at it descends to its end at Whitesands beach.  This gave opportunity for a circular walk with only the uphill section back on the narrow paved road at the end of the walk as a repeat. 

Beside the narrow road leading down to Whitesands

Setting off the weather was again lovely; with crisp blue sky heralding what we hoped would be another glorious day.  However, weather hereabouts was proving fickle.  Each evening I watched from the elevation of Caerfai as thin cloud banks quickly rolled landward and then quickly dissipated as the sun cast out again, only for another cloud bank to follow.

Our route took us down to the beach, where we were confronted by a multitude of school children, all donned out in wet suits with their paddle boards aimed at the sea.  It was good to walk on the beach, somewhere we would revisit for an afternoon during a particularly warm spell of weather later in the week.  Our walk this time on its sands was only short as we headed north and soon joined the coastal path. 

Suzanne on the coastal path leading north from Whitesands

This section was like others we had visited with dramatic plummeting views downward to rocky coves, sandy beaches and towering sea stacks, and all experienced with the sea a constant blue and today the sky casting radiant.  It was indeed a good day to be out, but that weather hereabouts is a fickle beast. 

The view back toward Whitesands

We were looking for a path on our right leaving the main coastal path and which, hopefully, would take us toward our hill.  Thankfully we found it as the prospect of walking through the tough undergrowth away from any path is not recommended.

The path swung up gaining ground and always heading toward the western end of the Carn Llidi summit ridge.  As with many similar hills leaving the path can course calamitous results of floundering in copious amounts of evil undergrowth.  Therefore, I thought it prudent to ask one or two fellow walkers who were heading down in the opposite direction, whether and where the path continued.  We were met with conflicting advice, some encouraged going back down to another path and others seemed to discourage anything to do with venturing high on the hill.  I found this advice rather unusual, thanked them and off we went forever upward. 

Murky conditions starting to set in over Ynys Dewi

The path eventually swung up on to a concreted section leading to the summit of Carn Llidi Bychan; an outlier of the main peak and the farthest extension of the rocky western end of the summit ridge.  As height was gained we looked out toward Ynys Dewi, which was now being overtaken by one of those fickle weather conditions with grey murk approaching.

Ancient burial chamber beside the path on the way to Carn Llidi

The initial continuation toward the main peak was easy enough, with a variety of narrow paths leading toward the upthrust of the summit cone.  As we reached where path butted against rock, Suzanne decided that was far enough for her and found a sheltered spot away from the increasing strength of the wind, to wait until I visited the summit and hopefully descended safely back to where she was now happily sitting and admiring the view northward. 

Approaching the summit cone of Carn Llidi

When approaching Carn Llidi from the west its highest point requires hands on rock to reach its summit.  I used to hunt out any scramble and have many fond memories of weekends spent in Nant Peris, evenings in the Vaynol Arms, breakfasts in Pete’s Eats and late mornings and afternoons venturing on to Eryri peaks via scrambling on rocky ridges.  This at that point of my life was the norm.  I found it highly enjoyable and considered myself competent enough to know when to back off from something that looked beyond my limit.  However, age and scrambling not being the norm can quickly lead to lack of confidence on rock, and this was only confounded when in October 2023 I slipped and fell from a rocky ridge close to Moel Hebog.  Falling on the opposite side of the ridge would probably have resulted in death.  I was fortunate to walk away with just a large bruise on my upper thigh and a few scratches.  This experience dampened any confidence I had left when confronted with hands on rock and those scrambles that in my younger days were the norm.  Today was the first time I had encountered rock since the day I had fallen.  This all sounds rather melodramatic, but it is as it is and it feels good to write about such things and be as honest as I can.

Before venturing up the rock I took my rucksack off and left it at the base of the summit cone and safely zipped my camera in its case.  The way up was obvious as the rock was discoloured through many peoples visits over the years, it involved two sections of scrambling before reaching the high point, the first up a diagonal wide groove and the second a metre or two traverse to the left and then up a few steps to where the summit opened up.  By the time I reached the top it was definitely windy, not so much to be dangerous but enough that I was thankful I had decided not to bring the Trimble.

The view north-eastward up the coast from the summit of Carn Llidi

Reversing my upward route was relatively easy, as with most things of a similar nature, taking ones time is essential.  Soon I was back at my rucksack and shortly afterward sitting beside Suzanne tucking in to some yummy morsel of food.  As we gathered our stuff to head down we felt the first drop of rain that was being pushed landward beyond the grey sky murk that we had seen over Ynys Dewi on the latter part of our ascent.

Our route down was easy, reversing the summit ridge to Carn Llidi Bychan and the narrow concrete path leading down to the main path, here we continued down toward the road, instead of swinging rightward and rejoining the coastal path.  This soon brought us out on to the road and that nasty little bit of uphill at the end of the walk, never the best at the end of any walk. 

Relaxing in the car with our picnic with the cloud base now enveloping Carn Llidi

During our descent the weather continued to close in, with those succulent blue skies of earlier now replaced by greying murk with intermittent spells of light coastal drizzle being brought in on the wind.  The rain was never heavy enough for me to put waterproofs on and we arrived back at the car still dry from our endeavours.  All that remained was a quick change whilst the kettle was boiling and to have a feast of a picnic sitting in comfort looking out of the car window as the whole upper ridge of Carn Llidi disappeared under grey murk. 

 

Survey Result: 

 

Carn Llidi 

Summit Height:  182.1m (LIDAR)  

Summit Grid Reference:  SM 73797 28001 (LIDAR)

Bwlch Height:  57.8m (LIDAR)

Bwlch Grid Reference:  SM 76096 28625 & SM 76132 28642 (LIDAR) 

Drop:  124.3m (LIDAR)

Dominance:  68.27% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet 

Saturday, 9 September 2023

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

13.07.23  Yr Allt (SJ 242 100, previously Trimbled) 

Yr Allt (SJ 242 100)

It was my pleasure today to join Sarah Kerr on part of her Offa’s Dyke walk.  Sarah had contacted me a few weeks ago and asked if I would like to join her for a few hours as she was walking part of the long distance footpath north of Welshpool.

Considering how wet recent days have been we were ever so fortunate with the weather as although an occasional slow moving shower was forecast for parts of Wales, any grey cloud that materialised did not develop in to rain and our walk remained dry. 

Sarah Kerr

I met Sarah at 8.30am on the Rhallt Lane outside the recently built and large property where she overnighted.  The morning was beautiful with blue sky and the hint of warmth in the air.  It was good to see her as the last time our paths crossed were a number of years ago when trips to Welsh islands and lighthouses were organised.

Prior to meeting I suggested the possibility of including an ascent of Yr Allt from the Rhallt Lane and dropping off the hill back on to the canal towpath which hereabouts also forms a part of Offa’s Dyke footpath.  Sarah was on for this, therefore after pleasantries we walked up the steep lane chatting about all manner of things.  The conversation must have been good as even though I’d been this way a number of times over recent years we overshot the footpath I planned for us to follow.  This meant we remained on the lane as it turned in to a track and we followed it to its high point. 

In the field leading toward the trig pillar

At the end of the track a footpath continues through undergrowth to connect with a forest track, however we now headed to our right on to a steepening field where wild flowers predominated, with a plethora of butterflies flitting this way and that in the warmth of the strengthening sun. 

Approaching the trig pillar

This part of the field forms a ridge that leads ever upward to where the triangulation pillar sits confidently looking north-eastward out toward the Breiddin and the higher hills to the west.  The western horizon was dominated by the Y Berwyn ridge with the higher Aran also on show, with their elongated ridge still battling with wisps of cloud which no doubt would soon be burnt off. 

The distant Y Berwyn

Leaving the trig pillar we lost height heading toward the corner of the lower field, where a stile gives access to another field leading past the large mast that can be seen from many miles away signifying the summit area of this hill.  Shortly beyond is the high point, it doesn’t afford the view that the ground beside the trig pillar does, but it is the summit and therefore with my bagging hat on it had to be visited. 

Sarah at the summit of Yr Allt

To get on to our descent route we now doubled back to the trig pillar and followed the ridge downward past pheasant pens and the Gamekeepers Cottage at the end of the forest track.  Down we went heading toward the Coppice Cottage where many a year ago I used to live.  However, before the cottage is a forest track on the right that heads down through the wood.  I had always wanted to investigate this track and see where it leads.  Having already mentioned this to Sarah she had no objection to us investigating this route.

The track led us down through the wood and seemed to grind to a halt where summer undergrowth of nettles and brambles then took over.  Just below us was a high pheasant fence which conveniently for us had been flattened due to a tree bow falling on it.  However, between us and it was all manner of debris which entailed an assault course to get through, which we eventually did, emerging on to an open field and with the aid of mapping on Sarah’s mobile phone we were soon directed down the field to a footbridge crossing the canal.

After crossing the footbridge we had one barb wired fence to negotiate before reclaiming the canal towpath.  Our onward routes now headed in opposite directions, Sarah farther northward following the footpath of Offa’s Dyke and southward for me back toward Welshpool. 

Sarah heading off on the canal towpath to continue her Offa's Dyke journey 

Before heading our separate ways we had a hug and I thanked Sarah for the invite to join her.  It had been an immensely enjoyable few hours with good company, good conversation and a hill thrown in for good measure!


Survey Result: 

 

Yr Allt

Summit Height:  231.3m (converted to OSGM15, from previous Trimble GeoXH 6000 survey)

Summit Grid Reference:  SJ 24240 10005 (from previous Trimble GeoXH 6000 survey)

Bwlch Height:  125.9m (LIDAR)

Bwlch Grid Reference:  SJ 21855 08773 (LIDAR)

Drop:  105.4m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

Dominance:  45.57% (Trimble GeoXH 6000 summit and LIDAR bwlch)

 

 

For details on the first Trimble GeoXH 6000 summit survey of Yr Allt

For details on the second Trimble GeoXH 6000 summit survey of Yr Allt

For details on the Trimble GeoXH 6000 bwlch survey of Yr Allt

For details on a third visit to the summit of Yr Allt

For details on a fourth visit to the summit of Yr Allt

For details on a fifth visit to the summit of Yr Allt

 

 

For further details please consult the Trimble Survey Spreadsheet

 

 

Friday, 4 November 2022

Mapping Mountains – Trimble Surveys – Yr Eifl

 

17.09.22  Mynydd Mawr (SH 140 258) 

Mynydd Mawr (SH 140 258) from a previous visit to the hill

As a child my family holidayed at Morfa Nefyn and Edern.  I have a distant memory that during one of these holidays we headed to the end of Pen Llŷn and drove up the concrete road that leads to the summit of Mynydd Mawr.  We could have done this more than once, but my memory only retains small segments from my childhood and even these only give me the semblance of one distant childhood visit. 

For many years we spent our holidays in this house in Morfa Nefyn

It would be many years later when I next visited this hill and since then I have been back to survey its summit and visited again with my brother.  This time I was with my aunt, cousin and brother.  We were staying in Nantlle and a road trip taking in the beauty of the Llŷn had been suggested. 

The view from the coast at Nefyn

It is all too easy to accept the land one lives in; after all it is the land one is used to.  However, heading from Welshpool to Nantlle my aunt and cousin both marvelled at the beauty of the land we were travelling through.  I had done this journey countless times over many years and although I would like to think my eye is still appreciative of this land, there is no doubt an acceptance on my part, as for me it is a constant.  Seeing it with new eyes through the experience of my aunt and cousin gave me added appreciation of just how beautiful this land is and by that fact, how fortunate I am to live where I do.

On our way down Pen Llŷn we visited the old houses where we holidayed, reminiscing on times now long gone.  A multitude of narrowing lanes lead west down the Llŷn toward the paved road that starts its way up Mynydd Mawr, this soon turns in to a concrete road ending at the top of the hill, where a levelled section gives adequate parking for a number of cars.  We weren’t the only ones heading up this hill, there were a few walkers on the manicured green paths, but in the main it was the convenience of a car that brought people here. 

Looking inland toward the high Eryri peaks

Having parked I sauntered off to stand on the high point and before joining Bryn, Shirley and Julie I took a few minutes to look inland toward the higher peaks of Eryri which were framed by a sweeping coastline.  It was a stunning view, whilst behind the great swathe of the Irish Sea dominated, following this around and the bulk of Ynys Enlli looked back as a darkened silhouette, whilst to its right a slight greyed outline of the distant Wicklow hills, south of Dublin could just be picked out.

Leaving the summit I joined Bryn, Shirl and Julie on the series of steps leading down with the distant Ynys Enlli ahead.  We followed these for a while before stopping, all round was the expanse of sea, a huge blue mass stretching to the horizon. 

Looking out toward Ynys Enlli

We stayed looking out to sea for quite some time and once heading back up the steps we veered rightward to join one of the paths leading up the hill toward the top, this soon led us back to the car.  It’s always good to visit this summit, be it by foot or car.  It signifies an end of land and if the weather conditions are favourable, as they were today, it can give a dramatic element to this beautiful land that we live in. 

 

Survey Result:

 

Mynydd Mawr

Summit Height:  160.0m (converted to OSGM15, from previous Trimble GeoXH 6000 survey)

Summit Grid Reference:  SH 14021 25869 (from previous Trimble GeoXH 6000 survey)

Bwlch Height:  64m (spot height)

Bwlch Grid Reference:  SH 14952 26292 (spot height)

Drop:  96m (Trimble GeoXH 6000 summit and spot height bwlch)

Dominance:  60.00% (Trimble GeoXH 6000 summit and spot height bwlch)

 

 

For details on the survey of Mynydd Mawr

For details on the 2nd visit to Mynydd Mawr

 

For further details please consult the Trimble Survey Spreadsheet

 

 

 

Friday, 12 August 2022

Mapping Mountains – Trimble Surveys – Moel y Gamelin

 

20.06.22  Copa’r Frân (SJ 206 703), Moel y Crio (SJ 199 696) and Moel y Gaer (SJ 210 690) 

Copa'r Frân (SJ 206 703)

The land between Mynydd Helygain in the north and Moel y Gaer in the south is relatively open with occasional houses and farms dotting the landscape.  This area has been mined extensively, mainly for lead and limestone, and it still has a working quarry positioned just to the west of the three hills we planned on visiting today.

I was out with Mark Trengove, who had suggested this walk.  During the restrictions imposed due to Covid-19, Mark had used Moel y Gaer as his go to hill, racking up a multitude of ascents in the process.  This whole area is dotted with greened paths snaking between copious amounts of undergrowth and it proved an enjoyable experience visiting these hills with Mark acting as the local guide.

As an evening meal was planned with Mark and Louise we left our walk until mid-afternoon, by which stage the weather had warmed giving clear heat with a beautiful blue sky above casting vivid colour across the land.

These hills are easily visited as a myriad of narrow lanes criss-cross the area.  We parked close to the small community of Catch and then sauntered over grass heading toward the high masts positioned near the summit of our first hill of the day.

Nearing the top, Mark directed me toward the summit and I soon had the Trimble set-up gathering data.  It was good to be back out on a hill, with a few weeks spent away doing other stuff.  Once data were safely gathered and stored I packed the equipment away and we headed down to the few houses that nestle just below the high point of the hill.  Here we met Tina Cook, who was heading out to collect her daughter from school.  Tina explained that her family is local and she had lived here for 30 years.  We asked about the hill and whether it was known by a name, Tina told us its name is Copa’r Frân, which is also the name of her house.  Thanking her for her time, we left heading south-westward, bi-passing the large compound housing the masts and used a series of green paths toward our second hill of the day. 

Gathering data at the summit of Copa'r Frân

By now the heat of the afternoon was building, this was partly welcome but also rather debilitating.  I was glad of our route which was not too taxing, as the thought of attempting any prolonged walk in these warm conditions was not one to savour. 

Moel y Crio from Copa'r Frân

En route to our next hill we called at a farm and spent the next 15 minutes or so talking with the farmer, who confirmed the name of Moel y Crio for our next hill and proceeded to give us a variety of anecdotes about the local area.  Leaving the farmer, Moel y Crio loomed above with its northern aspect festooned in gorse.  However, my local guide knew where the path was and we were soon plodding our way up steepening slopes to the open ground at its summit.  During data collection we sat on grass below the equipment so as not to disturb satellite reception and munched on an assortment of pick-n-mix. 

The path through the gorse leading to the summit of Moel y Crio

Gathering data at the summit of Moel y Crio

The bwlch for Moel y Crio was positioned between us and our third and last hill of the day; Moel y Gaer, and once the Trimble was packed away I followed Mark down the steep path to the greened land below.  A track crosses the area of the connecting bwlch and we were soon debating where its critical point was positioned.  Once decided upon the Trimble was soon set up gathering its third data set of the day. 

Gathering data at the bwlch of Moel y Crio

Leaving the bwlch I followed Mark as we joined up with a series of narrow paths heading toward a pool, before joining one of the main paths leading up Moel y Gaer.  This hill was definitely the highlight of the day and is a worthy inclusion in the list of The Huws – 100 Great Welsh Hills under 2,000ft. 

Heading toward Moel y Gaer

The area of the summit is enclosed by an impressive ancient embankment which we followed around its southern side.  From this vantage point the view was extensive with late afternoon light enhancing our surrounds. 

On the southerly part of the ancient embankment encircling the summit of Moel y Gaer

A path leads from the embankment detouring toward the summit which consists of an ancient tumulus.  This point was surveyed with the Leica 530 in May 2009 resulting in confirmation that the tumulus is the high point.  However, in 1979 a covered reservoir was built on the summit area and its high point was found to be 0.63m higher than that of the tumulus, but as this is a relatively recent man-made construct it is discounted from the summit height of the hill.

The Trimble was soon positioned aligned with the summit on top of my rucksack with the measurement offset between its internal antenna and the ground at its base noted, and as individual datum points were collected I sat with Mark, below the equipment looking out toward the expanse of Liverpool in the distance. 

Gathering data at the summit of Moel y Gaer

It was now time to head down and a green path led us back to the awaiting car.  It had taken three hours to complete the walk; it proved a leisurely affair in excellent walking country. 

 

Survey Result: 

 

Copa’r Frân  (significant name change)

Summit Height:  286.1m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SJ 20624 70354 (Trimble GeoXH 6000)

Bwlch Height:  265.7m (converted to OSGM15, Leica GS15)

Bwlch Grid Reference:  SJ 20803 70065 (Leica GS15)

Drop:  20.4m (Trimble GeoXH 6000 summit and Leica GS15 bwlch) (200m Sub-Twmpau addition)

Dominance:  7.12% (Trimble GeoXH 6000 summit and Leica GS15 bwlch)

 

 

Moel y Crio

Summit Height:  297.5m (converted to OSGM15) (significant height revision)

Summit Grid Reference:  SJ 19988 69614 (summit relocation)

Bwlch Height:  276.8m (converted to OSGM15)

Bwlch Grid Reference:  SJ 20406 69385

Drop:  20.7m (200m Sub-Twmpau addition) (Welsh Sub-P15 reclassified to Welsh P15)

Dominance:  6.96%

 

 

Moel y Gaer

Summit Height:  303.7m (converted to OSGM15, Leica 530) 303.8m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SJ 21065 69078 (Leica 530) SJ 21065 69078 (Trimble GeoXH 6000)

Bwlch Height:  176.2m (LIDAR)

Bwlch Grid Reference:  SJ 11953 75033 & SJ 11953 75031 & SJ 11954 75028 & SJ 11953 75027 (LIDAR)

Drop:  127.4m (Leica 530 summit and LIDAR bwlch) 127.6m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  41.97% (Leica 530 summit and LIDAR bwlch) 41.99% (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

 

For further details please consult the Trimble Survey Spreadsheet