The first thing to notice is that the Kennet and Avon Canal has gone from green to yellow for no good reason except to distinguish it from the Thames which is now green, and secondly it joins the Thames about half way across England at Reading (famous for virtually nothing). UPDATE September 2023 - I am starting to make Web-Apps for the Camino Path from Reading to Southampton (4 segments) and 25 more segments across Spain to Santiago de Compostela.

To start from the London end of the Thames it is Tidal (and of course Navigable) as far up as Teddington Lock (famous for fish slapping).

Then the red shadow (map and elevation) shows that for about 120 miles across to Lechlade it is Non-Tidal but MADE Navigable (230 ft rise in height) by 46 or so Locks.

Further West it is Non-Navigable as it becomes a trickle barely making it across the Cotswolds AONB "border", and you may view my Cotswolds Virtual Tour (later again) if you wish.

So the obvious difference between the two mug shots is that the Thames decreases in its "transportation value" the further West (and higher) it goes particularly after it picks up the Oxford Canal (coming soon) at Oxford (and Eynsham Wharf in olden times).

It was seen that the best way to "come down the other side" was to follow the River Avon and the best way TO that course was via the River Kennet, by forking off the Thames at Reading (once you open the Web-App it can be seen in Pano 243 in Section 4 on Walk 25), even though this involved a very steep drop of 300 ft via the amazing lock flight at Caen Hill.

Having explained that overall picture, you may have noticed a bit of useless trivia in that the distance from Reading (Pano 243) to the Western end of both walking trails is the same at about 89 miles, so we can now start the Thames Path walk AT that point on the Thames Path where there is but a trickle even when raining or forget the first 22.8 miles and start at the Trout at Lechlade as above.

The total length is 182 miles and I have divided that into 58 Walks in 11 Segments (both sides of the Thames from Teddington to Greenwich). The development of the Web-App was delayed awaiting the Street View Panos promised in this Guardian Article in 2016. When those did not eventuate for the Thames Path by 2018 I went ahead WITHOUT the main anticipated feature of panos. Then by 2022 Uy Hoang had filled the void and here is his video.

He probably published 20,000 Street View panos to Google Maps for the Thames alone so I used the Google embedding tool to link via 580 thumbnails to selected panos (maybe 90% of which were published by Uy Hoang) for all 58 Walks and made a major Update of the Web-App in 2022.

I had also been frustrated in making custon SatNavs for the Walks as some 30% of the Walks refused to "track". Then I managed to become a Google "Road Fixer" and better still a "Content Partner" and by May 2023 I had completed the long task of identifying and fixing all of the "broken links" and having them Approved on Google Maps.

So a (hopefully) final Update provides the present version of the Web-App, intended to be used both for Virtual Tours (preferably on a "big screen" device such as a laptop) and also "on the trail" using a mobile device.