Guides

Step by step, for when something on your phone or computer doesn't work right away.

• Sharing your locationWhy Sumish asks for your location, what we do with it and how to switch it on on iPhone, Android, Windows or Mac. Or just type a town.

Which data we use, who publishes it and how often we fetch it.

• CBS figures on neighbourhoods and municipalitiesWhere the figures for neighbourhoods, districts and municipalities come from, which year they are from and why CBS sometimes keeps a figure secret.
• CBS prices: inflation, fuel and energyWhich Statistics Netherlands (CBS) series we use for inflation, pump prices and energy tariffs, how often they update and what provisional means.
• Current prices in the calculatorsWhich price is already filled in for fuel, charging and energy, which CBS series it comes from and what happens when it is not available.
• KNMI weather dataWhere Dutch weather on a date gets its measurements: the daily data of the KNMI weather stations since 1901, the nearest station and what is normal.
• Maps and addresses: PDOK and the KadasterWhere the map, the addresses and the postcodes on Sumish come from, and why the map runs through our own server and passes nothing on about you.
• Parking, charging points and petrol stations: where the data comes fromWhich registers supply the car parks, charging points and petrol stations, how often we refresh them, what is missing and how to report a mistake.
• The RDW vehicle dataWhere the Dutch Number Plate Check and the other car tools get their data, how often we update it and why we show nothing about owners.

How we calculate, check and keep the tools up to date.

• Exercise and calories: how our tools calculateWhere the exercise tools get their figures: the Dutch activity guideline, MET values, the calorie formula, converting steps and official sources.
• How our calculators work and how reliable a result isHow a result comes about, what indication or worked example means, how we round and how we check the formulas.
• How we keep everything currentWhich data updates itself, which rates we check by hand every year and what Last reviewed means on a tool.
• How we make sure data stays current and checkedWhat you can see of the review date, the values with an effective date and the data that updates itself, and what we do when a source goes quiet.