Position error scatter
Each dot is one epoch: GNSS position minus Total Station position. The centre is the Total Station. Scroll to zoom, drag to pan, click a dot to select it.
Check vessel GNSS positions against Total Station control, per IOGP 373-19 / IMCA S 015
Each dot is one epoch: GNSS position minus Total Station position. The centre is the Total Station. Scroll to zoom, drag to pan, click a dot to select it.
The pass/fail result compares a 95% horizontal figure with the limit below.
Hover for values, click to select an epoch. Toggle series with the chips.
Histogram of horizontal error.
Share of epochs within a given error. Hover to read.
Accuracy 95% per receiver against the limit. Click to open one.
Raw fixes around the observation window from the imported vessel log. Left: position scatter of the log. Right: HDOP and satellite count, with Total Station epochs marked.
PNG, JPG or SVG. It appears in the page header and at the top of the PDF report.
Plotted from the control point coordinates above. Set the UTM zone and hemisphere of your grid, and the map updates as you type.
The map assumes WGS 84. If your grid uses another datum, the plotted position can be off by metres to hundreds of metres.
Up to four photos for the PDF report: the toolbox talk, the BM close-up, the BM from a distance with the vessel visible, and the vessel DGNSS location from a distance. They appear on a Photos page after the charts.
Photos stay in your browser. They are never uploaded and are lost when you close or reload this page.
Import the receiver log for the active receiver. Observed positions are filled in by matching each Total Station time to the nearest GPS fix.
Paste from Excel straight into the table. Enter moves down a row. Observed coordinates filled from a log are marked.
| Time | Ref bearing set | Bearing to GPS | Dist (m) | GPS observed | Total Station | Error (observed − TS) | Flag | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ° | ′ | ″ | ° | ′ | ″ | E (m) | N (m) | E (m) | N (m) | E | N | Horiz. | |||||