Planning tools

Three public tools that help decide when and where to survey. They all compute model values — indicative, and no substitute for professional judgement.

Planner

For a chosen place and day it shows the best survey windows, the number of visible satellites over time and a skyplot. It uses current orbital data (TLE); you set the elevation mask and which satellite systems are on.

• Windows — intervals with good satellite geometry (low PDOP, enough satellites above the mask);
• PDOP — the lower, the better the spatial spread of satellites (more precise position);
• Skyplot — the satellites' arrangement across the sky for a chosen time (tap the chart to change it).

The planner doesn't deal with the correction stream — it only says whether the sky is “good enough” at a chosen time.

Site corrections

Instantaneous geophysical displacements and atmospheric delays for a site and height:

• solid Earth tides — crustal deformation from the Sun and Moon (centimetres);
• pole tide — displacement from the motion of Earth's axis (from EOP data);
• tropospheric zenith delay — signal delay in the atmosphere per the GPT3 model.

Useful as an a-priori estimate during data processing or to check you see the expected effects. These are not RTK corrections — those come from the correction stream.

Coverage map

Where, and with what result, the community measures correction-stream quality. Each hexagon (~5 km) summarises anonymous checks nearby. Two layers:

• Stream health — mostly OK / mixed / frequent issues;
• Ionosphere — mean ROTI from measurements (quiet / elevated / stormy); an elevated ionosphere makes reaching a fix harder.

A cell appears only once it holds enough measurements (K-anonymity) — so the map can be sparse in less-covered areas.