GPS with barometer for rent here.

There are no costs except the reshipment.

The only condition is that the recorded data must be under an open license.

New Article about height measurements with GPS and GPS intern barometers here.

Some people had questions regarding the accuracy in the past. So here are some real world measurements und ideas to enhance the data.

Finally it´s done! Crowed Sourced Sea Depth Mapping is on the way.

Right on time for the Boot exhibition in Germany the portal for the collection of crowed sourced sea depth mapping is ready. Have a look at this.