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Path: ...!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: VanguardLH <V@nguard.LH> Newsgroups: comp.mobile.android Subject: Re: app for precision coordinates Date: Mon, 24 Jun 2024 17:39:51 -0500 Organization: Usenet Elder Lines: 21 Sender: V@nguard.LH Message-ID: <1b1b2tf0qx93x$.dlg@v.nguard.lh> References: <v-mdnaydDOIxuOX7nZ2dnZfqn_WdnZ2d@giganews.com> <v59arj$c11r$1@dont-email.me> <UKCdnUA20PinqOX7nZ2dnZfqnPqdnZ2d@giganews.com> <mwyu27wqkwt2.dlg@v.nguard.lh> <WdydnaYcj68u0uT7nZ2dnZfqnPudnZ2d@giganews.com> <1ib29f50d2bbn.dlg@v.nguard.lh> <ldtouaFjgohU2@mid.individual.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: individual.net a6yFThmbxZPKXf3OSd7wuwAVmJAata224nO5DazN0dQZRQ2N3N Keywords: VanguardLH,VLH Cancel-Lock: sha1:OFVJVwRmRC0BGm1DIRkBahBsBkw= sha256:kGnhT3M49/PLR4Rgwd5Fz+C/J7bpr7Hs6feM5bTDmG8= User-Agent: 40tude_Dialog/2.0.15.41 Bytes: 1789 Andy Burns <usenet@andyburns.uk> wrote: > VanguardLH wrote: > >> Don't remember seeing a smart >> phone stating it can use DGPS, so you'll likely have to find a GPS >> receiver that can find DGPS stations. > > Build your own RTK GPS > <https://www.youtube.com/watch?v=Oc1LBFDj2MA> > > (yes, I know the O/P wants to spend on trees, not tech toys). The video author mention RTK (Real-Time Kinematic) positioning which sounds very much like DGPS (Differential GPS) where land-based stations knowing their exact position relay that to the roving GPS receiver to add to the positioning it gets from the satellites. The author said the range of the RTK land station is 20 km (12 miles). I thought it was 200 miles for DPGS, but then that couldn't get around the Earth's curvature.