Home › Navigation
Information
Apple ID593639170
Bundle IDRijkeSoftware.GCTKiPhone
SellerSeller
Min iOS14.0
Min macOS11.0
Device familiesiphone, ipod
Released2013-01-20
Copyright© 2026 RijkeSoftware
Privacy policyLink ↗
Preview 1 platform
iPhone 9 images
What’s New Version 5.1.5
Bugfix release
Description
150+ tools and decoding tables to help you solve mystery- and multi-caches and make navigational computations, conversions, decodings and text analyses.
The number of tools will grow depending your input, so mail us to suggest/request a new tool or decoding table!
* No additional in-app purchases required
* No additional charge for features/tools that will be added in future versions.
GCTK features:
CONVERSIONS
Base64/Binary/Decimal/Hex to ASCII
Binary/Decimal/Hex/Octal conversions
Celsius, Fahrenheit and Kelvin
D°M'S" conversions
Distances
Roman numbers
NAVIGATION
2 WPs + 2 bearings = new WP
2 WPs + 2 distances = 2 new WPs (Intersections of 2 circles)
3 WPs + 3 distances = new WP (Intersection of 3 circles)
Centroid & surface of triangle
Centroid of circle through any 3 WPs
Coordinatesystem conversions (3800+ systems!)
Crossing lines
Distance, bearing, middle of 2 WPs
Project a new WP
WP/Bearing + WP/Distance = new WP
DECODING: TABLES
Alphabet, Gernreich
Alphabet, Latin
ASCII
Baal horizontal
Baal diagonal
Bacon
Brahmi
Chappe
Futurama
Hexahue
HVD code
Illuminati cypher
Mayan numerical coding
Periodical system
Pigpen cyphers (3 x)
Resistor colorcodes
Sign language
Signal flags: maritime
Signal flags: NATO
Signal flags: semaphore
Web- & WingDings
- and approximately 90 more...
DECODING: INTERACTIVE
Braille
ROT-5/13/47 rotation
Cellphone keypad (char to num)
Cellphone keypad (num to char)
Morse
Signlanguage
Vigenère
NUMBERS
Prime numbers
Fibonacci numbers
Pi (decimals)
e (decimals)
TEXT
Frequency analyses
a=1, b=2, a=26, b=25, etc
Count characters
Count words
Hint decrypting
OTHER
Sudoku solver
QR code scanner
Barcode scanner
UPCOMING FEATURES:
- more and other tools depending your input!
Accessibility
ipadiphonemacrealityDevicetvoswatch
Version history 25 versions
Build 882597668v5.1.52026-02-20 00:09:36
Bugfix release
Build 877607781v5.1.42025-08-28 13:22:45
Maintenance release
Build 875791408v5.1.32025-06-22 21:23:23
Bugfix for Navigation, Projection when calculating in feet.
Build 871259128v5.1.22024-12-19 13:37:33
Removed What3Words due to quota exceedances
Build 867759926v5.1.12024-07-26 11:29:10
Bugfix in decodingtables
Build 867462962v5.1.02024-07-17 14:25:37
- Added QR- & barcode scanner for photos library (Idea of David W.)
- Quickmenu repairs and corrections
- Credits localized
- Minor layout changes
Build 867330412v5.0.12024-07-09 09:33:55
- Total new look for better use and readability
- Decoding tables overview now shows examples
- Improved navigational calculations, using elliptical earth calculations now (not all calculations yet)
- Many layout changes
- Minor bugfixes
Build 867062295v5.0.02024-07-07 15:52:56
- Total new look for better use and readability
- Decoding tables overview now shows examples
- Improved navigational calculations, using elliptical earth calculations now (not all calculations yet)
- Many layout changes
- Minor bugfixes
Build 864834116v4.7.42024-03-31 12:13:25
- bugfix for crossing lines
- small improvement in WGS84 coordinate entry
Build 861904105v4.7.32023-12-01 23:25:55
- Bugfix for copying current GPS coordinate into coordinate textfield
- Removed ° sign throughout entire app to prevent copy/paste interaction problems with other apps.
Build 860957484v4.7.22023-10-25 20:13:24
Maintenance release
Build 860452129v4.7.12023-10-06 20:20:30
Bugfix & minor code cleanup
Build 846958156v4.72022-02-01 14:42:58
- Added calculation for antipodal coordinates
Build 845917951v4.6.12021-12-18 01:28:49
New version with explanation text improvements
Build 845321520v4.62021-12-06 01:10:14
- Explanation added, use the i-button to view
- Some minor improvements in the layout of some screens
Build 844807908v4.52021-10-20 20:48:23
Added Gade calculation
Build 844486698v4.4.12021-10-10 09:56:09
- when selecting QR/barcode output, keyboard would show up unnecessarily
- added safeguard for incorrect QR/barcodes
Build 844352213v4.42021-09-30 09:13:31
- Corrected radius calculation in Circle through any 3 WPs
- Corrected Sudoku layout
- Redesigned sharing and mapview of navigation results
Build 842737613v4.32021-06-20 16:54:56
Added Geohash to navigation
Build 842000075v4.2.22021-04-29 21:50:25
Bugfix: keyboard wouldn't remove after entering search text in Coordinatesystem Conversions
Layout constraint irregulaties corrected in several screens.
Build 840004678v4.2.12021-01-13 01:19:32
Bugfix release due to possible double entries when moving items in quickmenu
Build 837383437v4.22020-08-19 20:19:29
- Changed QR/Barcode scanner layout
- QR/Barcode type is shown now
- Small layout changes
Build 834492687v4.1.12020-01-27 21:11:06
Bugfix release; quickmenu didn't function properly
Build 832229871v4.12020-01-23 14:44:58
- Added menu option My quickmenu
- Made coordinate entry easier/faster
- Coordinate entry now up to 4 decimal places
- Improved Vigenere decoding
- Improved full screen layouts
Build 831040089v4.0.12019-04-19 18:24:18
Bugfix for input; decimal figures were in some cases not included in the calculations
Price history by region
Currency
Show
Columns
Search
Availability 21 of 21 storefronts
| Region | Language | Price | Ratings | Avg | Version |
|---|---|---|---|---|---|
US | en-US | USD 1.99 | 11 | 4.0 | 5.1.5 |
BG | en-GB | EUR 1.99 | 0 | — | 5.1.5 |
BN | en-GB | USD 1.99 | 0 | — | 5.1.5 |
BS | en-GB | USD 1.99 | 0 | — | 5.1.5 |
BT | en-GB | USD 1.99 | 0 | — | 5.1.5 |
DO | es-MX | USD 1.99 | 0 | — | 5.1.5 |
EE | en-GB | EUR 1.99 | 0 | — | 5.1.5 |
EG | en-GB | EGP 99.99 | 0 | — | 5.1.5 |
IQ | en-GB | USD 1.99 | 0 | — | 5.1.5 |
JM | en-GB | USD 1.99 | 0 | — | 5.1.5 |
JO | en-GB | USD 1.99 | 0 | — | 5.1.5 |
LB | en-GB | USD 1.99 | 0 | — | 5.1.5 |
LY | en-GB | USD 1.99 | 0 | — | 5.1.5 |
NI | es-MX | USD 1.99 | 0 | — | 5.1.5 |
OM | en-GB | USD 1.99 | 0 | — | 5.1.5 |
RO | en-GB | RON 9.99 | 0 | — | 5.1.5 |
SI | en-GB | EUR 1.99 | 0 | — | 5.1.5 |
TT | en-GB | USD 1.99 | 0 | — | 5.1.5 |
UZ | en-GB | USD 1.99 | 0 | — | 5.1.5 |
VG | en-GB | USD 1.99 | 0 | — | 5.1.5 |
YE | en-GB | USD 1.99 | 0 | — | 5.1.5 |
Change log 29 changes · DO
✎
releaseNotes updated
Bugfix release
✎
description updated
150+ tools and decoding tables to help you solve mystery- and multi-caches and make navigational computations, conversions, decodings and text analyses.
The num
✎
subtitle updated
150+ geotools to help you !
✎
name updated
Geocaching GCTK
◆
Version 5.1.5 released
Bugfix release
◆
Version 5.1.4 released
Maintenance release
◆
Version 5.1.3 released
Bugfix for Navigation, Projection when calculating in feet.
◆
Version 5.1.2 released
Removed What3Words due to quota exceedances
◆
Version 5.1.1 released
Bugfix in decodingtables
◆
Version 5.1.0 released
- Added QR- & barcode scanner for photos library (Idea of David W.)
- Quickmenu repairs and corrections
- Credits localized
- Minor layout changes
◆
Version 5.0.1 released
- Total new look for better use and readability
- Decoding tables overview now shows examples
- Improved navigational calculations, using elliptical earth calculations now (not all calculations yet)
- Many layout changes
- Minor bugfixes
◆
Version 5.0.0 released
- Total new look for better use and readability
- Decoding tables overview now shows examples
- Improved navigational calculations, using elliptical earth calculations now (not all calculations yet)
- Many layout changes
- Minor bugfixes
◆
Version 4.7.4 released
- bugfix for crossing lines
- small improvement in WGS84 coordinate entry
◆
Version 4.7.3 released
- Bugfix for copying current GPS coordinate into coordinate textfield
- Removed ° sign throughout entire app to prevent copy/paste interaction problems with other apps.
◆
Version 4.7.2 released
Maintenance release
◆
Version 4.7.1 released
Bugfix & minor code cleanup
◆
Version 4.7 released
- Added calculation for antipodal coordinates
◆
Version 4.6.1 released
New version with explanation text improvements
◆
Version 4.6 released
- Explanation added, use the i-button to view
- Some minor improvements in the layout of some screens
◆
Version 4.5 released
Added Gade calculation
◆
Version 4.4.1 released
- when selecting QR/barcode output, keyboard would show up unnecessarily
- added safeguard for incorrect QR/barcodes
◆
Version 4.4 released
- Corrected radius calculation in Circle through any 3 WPs
- Corrected Sudoku layout
- Redesigned sharing and mapview of navigation results
◆
Version 4.3 released
Added Geohash to navigation
◆
Version 4.2.2 released
Bugfix: keyboard wouldn't remove after entering search text in Coordinatesystem Conversions
Layout constraint irregulaties corrected in several screens.
◆
Version 4.2.1 released
Bugfix release due to possible double entries when moving items in quickmenu
◆
Version 4.2 released
- Changed QR/Barcode scanner layout
- QR/Barcode type is shown now
- Small layout changes
◆
Version 4.1.1 released
Bugfix release; quickmenu didn't function properly
◆
Version 4.1 released
- Added menu option My quickmenu
- Made coordinate entry easier/faster
- Coordinate entry now up to 4 decimal places
- Improved Vigenere decoding
- Improved full screen layouts
◆
Version 4.0.1 released
Bugfix for input; decimal figures were in some cases not included in the calculations
USen-US
BGen-GB
BNen-GB
BSen-GB
BTen-GB
EEen-GB
EGen-GB
IQen-GB
JMen-GB
JOen-GB
LBen-GB
LYen-GB
NIes-MX
OMen-GB
ROen-GB
SIen-GB
TTen-GB
UZen-GB
VGen-GB
YEen-GB