New product, seems fine to making mapping, but don't know the cost, and whats the advantages/disadvantages comparing to https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-rec...
The standard V-Map system now features the following components and functionalities:
L1/L2 GPS phase measurements recorded on board at 20Hz
Power input ranging from 5V to 36V
LED indicator to monitor satellite reception
LED indicator to monitor proper data storage
Event marker port
One PPS outputs
Removable micro SD card for data retrieval
Dual frequency helix antenna
The weight of the receiver excluding external cables and antenna is 120g.