h:En:Measuring Strategy
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Simply measure where you are at the moment.
There is nothing special to do :-)
Switch on the logger before you sail off
and let it run for another half an hour after you have arrived.
Inhaltsverzeichnis
Systematic Collection
We recommend to collect the data of your home port and the approach to it systematically. Systematic collection is also advisable for anchorage bays, bays, and buoy fields.
- Important
- navigate as close to the shore as your draft allows
- navigate as close to any shoal as your draft allows
- sail parallel lines in a distance of 10..50m
- mark shoals on the map
Chaotic Collection
In areas, where many skippers are on the way (for example at the filling station in Palma, Mallorca), there will automatically be a dense collection of data by crowdsourcing. On the periphery of heavily frequenced ways, the density of measuring points is of course lower. In those cases of lower density, it helps to measure more systematically.
If you are at a mooring place, pier, or sway at anchor, don´t turn the logger off, so that a point cloud can develop. This helps us to calibrate the data.
Point cloud
Collection under way
Sail your trip as usual.
Your track will be recorded automatically :-)
You can optimize the result:
- navigate as close to the shore as your draft allows,
also when you are tacking - navigate in acircle around a shoal as tight as possible
and a second circle a little bit further
and if possible, also sail through two shoals - especially interesting are ports, bays, capes'
passages through islands, approaches.
So, if such a site is on your way: take it! - perform many manoeuvres in shallow water
- tack once in a while under motor in shallow water
Sometimes, simply an extra detour helps ...
To cover interesting sites systematically (go around the port, looking for an anchoring place, go between buoys and anchoring ships)
Navigate as close to the shore and to shoals as your draft allows.
Kreuzschläge and manoeuvres help to collect a broad track.
The most important data are those between 2 and 10m.
We assess all data between 0 and 100m (200m).
By Dinghy
With a Dinghy, with mobile GPS and sounder, you can measure very shallow banks. This is perfect for ports and anchorage bays. Children and teens love to use laytimes for such rubber boat trips!
About Technique
- http://depth.openseamap.org/#introduction
- Further pages in the Wiki: see box in the upper right corner
