# Sokuten: Survey Calculator

> SIMA import & field calcs

Canonical page: [https://chrome-stats.com/d/id6790451185](https://chrome-stats.com/d/id6790451185)

## Overview

- **ID:** `id6790451185`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Yuya Tanaka
- **Category:** Productivity
- **Version:** 1.1.2
- **Last updated:** 2026-08-17
- **First published:** 2026-07-20
- **Size:** 2.86 MB
- **Data as of:** 2026-09-24
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/sokuten-survey-calculator/id6790451185)
- **Website:** [https://sokuten-legal.vercel.app/](https://sokuten-legal.vercel.app/)
- **Privacy policy:** [https://sokuten-legal.vercel.app/privacy.html#en](https://sokuten-legal.vercel.app/privacy.html#en)

## Description

Read SIMA files, compute coordinates on site, and write them back — entirely on your iPhone. A coordinate calculator built for field surveying in Japan.

■ SIMA (survey data exchange format) support
Import SIMA files received via AirDrop or the Files app. Unreadable lines never stop the import: a report tells you which lines were skipped and why, and unrecognized records are preserved verbatim and written back in place on export.

■ Seven field calculations
Inverse (distance, bearing, height difference), radiation, open/closed traverse with closure error and compass-rule adjustment, intersection, area (coordinate method), offset stakes, and perpendicular foot. Register any result as a new point with one tap.

■ Input built for the field
A large keypad, one-tap switching between DD.MMSS and decimal degrees, intuitive negative coordinates, and high-contrast display for outdoor readability.

■ Designed so data survives
Atomic saves with three generations of automatic backups. If a save ever fails you are told immediately and can retry. No network access; your data is never sent to our servers.

■ No subscription
All calculations and SIMA import (up to 50 points) are free to try. Sokuten Pro (one-time purchase — see the App Store listing for current pricing) unlocks unlimited points, SIMA/CSV export, and unlimited history.

Note: Verify results before relying on them. For public survey or registration deliverables, follow the Survey Act and your client's specifications.

## Rankings

- #1,904,029 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6790451185)