I use my GPS12 on a motorized bicycle.
More pictures and an explanation.
All shown topographic maps date from 1996 to 1999 and are digitized with marked RD-coordinates.
For the legenda (what are those symbols on the map?) see here for 1:25.000 (706 kb) and here for 1:50.000 (635 kb).
You can find the map-numbers (for 1:25.000) and the time of their last update in a picture here (33 kb).
The map-numbers for the 1:50.000 maps are here (29 kb). The dating of the maps (1984 etc..) is not right: it is a very old picture.
For use of these Dutch maps see the explanation GPS en plaatsbepaling voor biologen by Laurens Sparrius.
A lot of people have difficulties when using digital scanned and calibrated maps with RD-grid. For those I made a special RD&Ozi-help page.
A Dutch version of this story is here.
If you want to use the WGS84 system then there is here a story.
All aireal images were taken in the spring of 1989 and that is a long time ago. Spot the differences with the situation of today by visiting the caches!
All satellite images were taken between 1992 and 1994 by the SPOT satellite. These fotographs are ortho-rectified so it looks like you see everything from straight above. One pixel in the picture is 10 m in the real world. The numbers on the rim give positions in decimal degrees. A small green cross shows the position of the cache within a few hundred meter.
In these pictures you look straight down from a hight of about 300 meters to the cacheplace. As you can see on the copyright notice in these pictures, they are made with Terra Explorer software.
When want to make your own pictures you first have to download a copy from the software here so you can use the pictures from this Dutch site.
Read the manual and help-file first. Then try to go to a position by use of the navigation window. Point the camera straight down. The coordinates are in the Dutch RD grid notation.
The links named 'description' will give you not only an English text describing the cache but also more environmental information.
| Creation date | Geocaching page (Dutch) | topo map 1:50.000 | topo map 1:25.000 | English cache description | aireal b/w picture | Satellite b/w picture | Aireal colour picture | Dutch RD-map coordinates |
| 7/25/2001 | 'Leiden Urban 1' | 131 kb | 121 kb | description | 189 kb | 215 kb | 90 kb | 093397/463364 |
| 7/25/2001 | 'Tuf-tuf' | 198 kb | 219 kb | description | 174 kb | 190 kb | 58 kb | 104754/457078 |
| 7/25/2001 | 'Biertje?' | 183 kb | 119 kb | description | 143 kb | 193 kb | 57 kb | 096533/460744 |
| 7/28/2001 | 'Eindpunt' | 228 kb | 169 kb | description | 177 kb | 191 kb | 53 kb | 102260/459056 |
| 7/29/2001 | 'Platland' | 199 kb | 285 kb | description | 198 kb | 190 kb | 53 kb | 092204/458007 |
| 7/31/2001 | 'Waterval' | 258 kb | 155 kb | description | 130 kb | 183 kb | 58 kb | 095493/457184 |
| 8/11/2001 | 'Leiden Urban 2' | 135 kb | 136 kb | description | 187 kb | 215 kb | 74 kb | 094528/464184 |
| 8/14/2001 | 'Boompjes' | 213 kb | 244 kb | description | 186 kb | 184 kb | 57 kb | 103625/455642 |
| 8/23/2001 | 'Uitzicht' | 112 kb | 265 kb | description | 103 kb | 181 kb | 59 kb | 091105/474974 |
| 8/29/2001 | 'Drassig' | 278 kb | 179 kb | description | 99 kb | 168 kb | 54 kb | 117440/462333 |
| 5/29/2003 | 'Brandnetel Eiland' | n.a. | 258 kb | description | n.a. | n.a. | 39 kb | 088614/458970 | 6/20/2003 | 'Hold your Horses' | n.a. | 56 kb | description | n.a. | n.a. | 39 kb | 085170/465775 | 11/22/2001 | 'Moeras' | n.a. | 205 kb | description | n.a. | n.a. | 39 kb | 094414/456092 |
Mr. Bannerjee from Benares is a travelling guest. I have given him his own guestpage
A lot is said about the HDOP (Horizontal Dilution Of Precision) and EPE (Estimated Position Error) but the proof is in the pudding. What have I observed in reality?
If you care to know click here.
In the Netherlands there are many markers, some are 'zichtpunten' and others are part of the national RD-Kernnet. If there are no caches in your neigbourhood then there are for sure some markers for you to find and photograph. More details about the Dutch situation I have put on his page. You can read on a special page about my adventures in benchmarkhunting (In Dutch!). But beware: many photograph make downloading a long task.
As in every European country we had many more railways in the old days. On topographic maps you can see traces of old railways. Sometimes they are converted to normal roads, somewhere else they simply disappeared beneath new buildings but many times they are converted to bicyclepaths. And in some cases only the rails and the bridges are removed and things are left to nature. A report of an expedition searching for remnants in and between Aalsmeer and Uithoorn, illustrated with many photographs (it takes its time to download!) is written by me.
Sometimes I am asked for an interview on the radio or asked by a newspaper about geocaching. When possible I will place a soundfile here of a 5 minute interview at Radio West at some later date. At the moment there is a scan of an article about geocaching in the local newspaper Leidsch Dagblad of aug 19, 2002.
Not much but the number is rising.
For this variation on the geocaching game I have made a separate page here.
In short: find, describe and photograph markers that are on the official Dutch list and every other kind of positionmarker you find.After the disasters of XI-IX new laws are made in Europe limiting civil rights. We now have Euro-Cybercrime laws extending national law across the borders. Some things are lawfull in my own country but not in another and there is no way to resist extradition. So regretfully I am obliged to add the following text to this website:
"Mit Urteil vom
12. Mai 1998 - 312 O 85/98 - 'Haftung für Links' hat
das Landgericht Hamburg entschieden, daß man durch die
Anbringung eines Links, die Inhalte der gelinkten Seite ggf. mit zu
verantworten hat. Dies kann, so das Landgericht, nur dadurch
verhindert werden, daß man sich ausdrücklich von diesen
Inhalten distanziert.
Hiermit distanzieren wir uns ausdrücklich
von allen Inhalten aller gelinkten Seiten. Diese Erklärung gilt
für alle auf unserer Homepage angebrachten Links.
Alle auf der
Homepage genannten Markenzeichen sind Eigentum der jeweiligen Inhaber."
