Comparison

nautiMessage vs CH16

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

nautiMessage

Features
Read full description

An easy way to send short signal flag messages to others using either text messaging or your email. Simply enter your message and press Copy and you can paste the signal flag message into your text. Includes a quick reference guide showing all the flags. This program is a great introduction to the mvSigFlags application which is a state-of-the-art training tool to help you quickly learn all the signal flags using mnemonic techniques. See more information on our website at www.mySigFlags.com

About

CH16

This maritime safety app provides instant access to global rescue coordination centers and features tools for generating distress messages and planning voyages. It offers real-time location tracking for man overboard situations and works offline, ensuring safety at sea.

Highlights
  • Global maritime rescue center directory
  • Interactive SRR zone map
  • GMDSS-compliant distress message generator
  • Man Overboard (MOB) mode with GPS tracking
  • Passage Plan for voyage declaration
  • Offline functionality
  • Multilingual support
Features
Read full description

CH16 by Global SAR Hub is the essential maritime safety app for every seafarer. Instantly access contact details for over 350 maritime rescue coordination centers (MRCC, MRSC, JRCC, JRSC) worldwide. View Search and Rescue Regions (SRR) on an interactive map and identify the center responsible for your current position in real time. Generate IMO/GMDSS-compliant MAYDAY and PAN PAN distress messages with audio playback. Activate Man Overboard (MOB) mode to record a GPS position and guide you back to the drop point. NEW - Passage Plan: declare your route and automatically notify all rescue centers along your way, in their own language. An essential step for your safety at sea. Get notifications when you cross into a new SRR zone. Save your vessel and captain information to automatically include them in your messages and passage plans. Available in 6 languages. Works offline. Key features: β€’ Global directory of 350+ maritime rescue centers β€’ Interactive SRR zone map with automatic detection β€’ GMDSS-compliant MAYDAY / PAN PAN message generator β€’ Audio playback of distress messages β€’ Man Overboard mode with GPS tracking and DMD format β€’ Real-time MOB map view β€’ Passage Plan: multilingual voyage declaration to RCCs β€’ Persistent vessel and captain profiles β€’ Voice recording of vessel name β€’ SRR zone change notifications β€’ Multilingual country search β€’ 6 languages: EN, FR, ES, PT, IT, DE β€’ Full offline mode Terms of Use (EULA): https://www.globalsarhub.com/terms-of-use.html Privacy Policy: https://www.globalsarhub.com/privacy-policy.html

Screenshots

nautiMessage3 screens
CH163 screens

Verdict

The call

The clearest difference is in-app purchases: nautiMessage at none against CH16's 2. nautiMessage also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. CH16 sells 2 in-app purchases, starting at $0.99 per month. nautiMessage asks for nothing beyond the download.

UpkeepUpdate frequency

nautiMessage ships an update monthly, CH16 every 2 months. The most recent releases landed on September 18, 2026 and September 6, 2026 respectively.

Scorecard2 real differences Β· 6 level
nautiMessage versus CH16: the parameters behind the verdict, then further details
ParameternautiMessageCH16
PriceFreeFree
Positive reviewsβ€”100.0% of reviews
Update frequencyMonthly β€” betterEvery 2 months
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
Monetizationβ€”Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 β€” better13.0
Further details β€” not scored
Size12 MB80 MB
Age rating4+4+
DeveloperMiravista Interactive L.L.C.Global SAR Hub

In-app purchases

None

nautiMessage

No in-app purchases

2 purchases

CH16

Subscriptions1
  • CH16 Pro$0.991 Month
One-time1
  • CH16 Pro Lifetime$4.99

Questions

Is nautiMessage free?
nautiMessage is free to download, with no in-app purchases.
Is CH16 free?
CH16 is free to download, with in-app purchases available.
Do nautiMessage or CH16 have ads?
CH16 shows ads; nautiMessage does not.
Which is updated more often, nautiMessage or CH16?
nautiMessage ships an update monthly, and CH16 every 2 months. Most recently, nautiMessage was updated on September 18, 2026 and CH16 on September 6, 2026.

Other comparisons