# Mark Time

> Celestial navigation time recording app for sextant sightings. (iPhone/iPad app by TrozWare.)

- Source: https://appshunter.io/ios/app/mark-time/id1305580742 (this page in markdown: same URL + `.md`)
- Developer: [TrozWare](https://appshunter.io/developer/477909805)
- Category: Navigation, Utilities
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: American English
- Released: 2017-12-11
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mark-time/id1305580742/reviews.md

## What is Mark Time?

Mark Time is an application for Celestial Navigation that solves the problem of how to take an accurate time reading to go with each sextant sighting.  

By simply tapping the screen you can record the exact time UTC as you take your sight, so you have no chance of making an error with the conversion, and this time is stored in one of five registers.

Very useful when you have an assistant, and ideal for taking readings when you are on your own.

As you record a time you hear a confirmation sound and feel a vibration, so there is no need even to look at the screen. In addition the actual latitude and longitude at each time can be accessed later to verify your calculations.  These options are all configurable in Settings to suit your own preferences.

You can optionally take a photo of your sextant at the marked time so that you can read your sextant or confirm your reading later. Pinch and zoom to get a really close look at the scale.

## Key features

- Accurate UTC time recording
- Five time registers
- Auditory and vibration feedback
- Optional sextant photo capture
- Configurable settings
- Latitude and longitude verification

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/mark-time/id1305580742/reviews.md

### 5/5 — CelNav- excellent program

*2023-08-02*

If you take celestial sights and want accurate time recording this is a must have app. Works perfectly and does a great job. My only minus is the tap to record is sensitive and you could accidentally erase earlier records. Perfect when taking sights by yourself.

UPDATE: Developer added a lock button per my suggestion. Thank you. Absolutely perfect app for taking celestial navigation sights. A definite must have.

### 5/5 — CelNav- excellent program

*2023-05-21*

If you take celestial sights and want accurate time recording this is a must have app. Works perfectly and does a great job. My only minus is the tap to record is sensitive and you could accidentally erase earlier records.
Perfect when taking sights by yourself.

### 5/5 — Great app

*2021-01-11*

This app really assists with taking accurate sun sights. The photo of the sextant allowed me to check, and correct, my readings on several occasions. 
However, one little bug - it’s all too easy to tap the screen by mistake, and the delete function doesn’t work properly, meaning useful readings can scroll off the bottom.

### 5/5 — Mark time is handy

*2020-08-15*

Great way to record 5 readings . Lets you check your sextant via pictures to correct an error in reading. Make sure to look at what’s under the applications info icon. 
If not careful with bad lightning the sextant photo can not be complete.
Provides UT date and time.

## Frequently asked questions about Mark Time

### What is Mark Time used for?

Mark Time is used to accurately record the exact UTC time when you take a sextant sighting for celestial navigation. It helps prevent errors in time conversion and stores readings for later verification.

### How does Mark Time help with sextant readings?

By tapping the screen, you can instantly record the precise UTC time, with confirmation sounds and vibrations. This ensures accuracy, especially when navigating alone or with an assistant.

### Can I take photos with Mark Time?

Yes, you can optionally take a photo of your sextant at the marked time. This allows you to review your sextant or confirm your reading later, with pinch and zoom functionality for detail.

### What devices does Mark Time support?

Mark Time is available for iPhone, iPad, and iPod devices.

### Is Mark Time free to use?

Yes, Mark Time is completely free to download and use, with no in-app purchases or advertisements.

### How often is Mark Time updated?

The latest version of Mark Time is 1.2, and it was last updated on July 31, 2023. This indicates regular maintenance and potential feature additions.

### What is the age rating for Mark Time?

Mark Time has an age rating of 4+, making it suitable for a wide range of users.

### Does Mark Time have ads?

No, Mark Time is ad-free. You can use the application without any interruptions from advertisements.

## Version history (last 3 releases)

### 1.2 — 2023-07-31

Tap the Lock button to block any inadvertent readings. Hold the Unlock button to re-activate the screen.
The last ten readings are stored, with the most recent five being visible. Delete recent readings to retrieve older ones.

### 1.1 — 2019-02-04

Take a photo of your sextant at the marked time, so you can check easily double-check your reading. 
Pinch and zoom on the photo to get a really close look at the scale.
Delete one of the 5 stored readings if you have tapped by mistake.

### 1.0 — 2017-12-11

No release notes.

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All apps by TrozWare: https://appshunter.io/developer/477909805

## Related topics

[sextant](https://appshunter.io/ios/topics/sextant) · [cam sextant](https://appshunter.io/ios/topics/cam-sextant) · [ez sextant](https://appshunter.io/ios/topics/ez-sextant)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*