Measured Mile Markers
Two pairs of towers, known as "measured mile markers", are set exactly one nautical mile apart and are used by ships to calculate their speed. The ship sets a steady course on a bearing perpendicular to the markers. When the two markers align, the time is noted and again at the second pair of markers. The ship then turns around and repeats the process in the opposite direction and the average of the two values is taken. Now that ships have GPS, this can be used to measure speed, but the markers are still used by some ships coming out of refit at Devonport. At night, the marker towers are illuminated so they can be seen from the sea.
On walks
- Talland Bay to Looe (6.8 mile walk)
Also mentioned in walks
- Talland Bay to Polperro (2.5 mile walk)
Get the iWalkCornwall app
Download the app and use it to explore the walks and to purchase a guided route.
The app will direct you to the start of the walk via satnav.
The app guides you around the walk using GPS, removing any worries about getting lost.
The walk route is described with detailed, regularly-updated, hand-written directions.
Each time there is a new direction to follow, the app will beep to remind you, and will warn you if you go off-route.
A map shows the route, where you are at all times and even which way you are facing.
Each walk is packed with information about the history and nature along the route, from over a decade of research than spans more than 3,000 topics.
Once a walk is downloaded, the app doesn't need a phone or wifi signal during the walk.
The app counts down distance to the next direction and estimates time remaining based on your personal walking speed.
We keep the directions continually updated for changes to the paths/landmarks - the price for a walk includes ongoing free updates.
