Price & coverage change log

First published snapshot of every state, regional and nationwide option and their list prices. Future price and coverage changes are logged against this baseline.

Trimble VRSVRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.More network from VA to ME. 30-day $375; yearly $3,135 net 30 or $275/mo.

$100 one-time registration contribution for one account; extra connections via $1,000/yr membership.

$300/yr or $50/mo per user for private users; free for WI government, higher-ed, federal and tribal users.

Volume tiers up to 40 logins for $20,000; one-time 90-day free test account.

Free regional state network (Southcentral, Interior, Southeast).

iNET (Southeast), MyWay RTKRTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.More, GreenMark, Keating Tractor, Trimble VRS Now Hawaii, Topcon Topnet Live ($1,800/yr), Carlson SkyNet ($1,500/yr).

Coverage maps, plan tables, casterCasterThe internet server that hands out correction streams. Your rover logs in to it, like tuning into a radio station.More details, formats and datumsDatumThe starting point and ruler that coordinates are measured from. The same spot has different numbers in different datums.More pulled from operator pages.