iPhone Screenshots


This is not your average GPS averaging app! AccuMark allows you to capture location events from your iOS device and average them over time. GPS location fixes are subject to various error factors. However, over a period of several hours, measurement errors have a tendency to cancel each other out. Depending on the measurement duration, local GPS reception conditions and solar activity, the achieved final accuracy can be less than one meter/yard. Please note that there is no guarantee on the final accuracy.

The concept of AccuMark implies use of the GPS hardware of your iOS device over a long period of time. Therefore you should use AccuMark only while the device is plugged into a power supply, for example an external battery pack. If you do not do this, AccuMark can drain the battery of your device fairly quickly.

To use AccuMark, position the iOS device at the location for which you would like to determine the coordinates. Then press the location button. The button will highlight to indicate that the application is taking samples. AccuMark plots all samples in the plot area. AccuMark will only consider samples that fall into a circle with a diameter of 20 meters for averaging. If you press the share button, you have the option to show the location on Apple Maps or Google Maps, or to copy it to the clipboard. You can also share the raw location samples as a comma-separated-values file.

What’s New

Version 2.1

Added measured altitude to the raw data export.
Improved the sampling algorithm.

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

random5463 ,

Works for me

Works on my iPad 7 just fine. I like that it has lots of resolution.
The 5th decimal place is about 3 feet. I place in one spot for about 1000 readings. Note the clouds (weather) seams to move the average.

blob83$ ,


No map until your location is exported and export button doesn’t work


Manfred Siwowolow
1.4 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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