Best Nautilus Lifeline Apps

250+ iOS apps curated and reviewed

2.7 avg rating

19 free apps

Updated October 2026

Finding the right nautilus lifeline apps can be overwhelming with so many options. We've analyzed 250+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top Nautilus Lifeline Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Nautilus GPS	Free	1.9★ (12)	No	No	Oct 2026
2	LifeLine Support	Free	—	No	No	May 2026
3	AquaEye Sonar Companion	Free	—	No	No	Oct 2026
4	GPT - Gpacers Poseidon Tracker	Free	—	No	No	Sep 2026
5	Lifeline: Personal Safety	Free	5.0★ (1)	No	No	Oct 2026
6	FlagMii	Free	4.0★ (1)	No	No	May 2026
7	DiveCore: Dive Computer	Free	—	No	Yes	Oct 2026
8	Safe Boating	Free	—	No	No	May 2026

Top Picks for Nautilus Lifeline

#1

Nautilus GPS by Icarus Aviation Ltd

Editor's Choice

1.9(12 ratings)

Free

Nautilus GPS screenshot 1

This utility app uses your iPhone's camera flash to program a unique MMSI number into a compatible marine rescue GPS device. This allows the device to send Man Overboard and emergency distress signals via AIS and DSC.

#2

LifeLine Support by MS TECHNOLOGIES AUSTRALIA PTY LTD

Strong Contender

🌐 Social Networking

0.0(0 ratings)

Free

LifeLine Support screenshot 1

LifeLine Support screenshot 2

LifeLine Support screenshot 3

LifeLine Support screenshot 4

#3

AquaEye Sonar Companion by VodaSafe Inc

Companion app to AquaEye

Worth Considering

0.0(0 ratings)

Free

AquaEye Sonar Companion screenshot 1

AquaEye Sonar Companion screenshot 2

AquaEye Sonar Companion screenshot 3

More Nautilus Lifeline apps to explore

GPT - Gpacers Poseidon Tracker

GPT - Gpacers Poseidon Tracker

GPT - Gpacers Poseidon Tracker

Gpacers Poseidon Tracker

Real-time marine safety tracking with smart alerts and offline support. This system ensures full visibility and control over your team, even without internet access, and logs all activity for traceability.

Real-time tracking mapAdvanced alert system (boundary, collision, lost signal)Offline operation support

🗺️ Navigation

Lifeline: Personal Safety

Lifeline: Personal Safety

Lifeline: Personal Safety

Instant Discreet Alerts

This personal safety app sends discreet SOS alerts to your emergency contacts with your real-time location and profile information. It features AI-powered safety check-ins and scenario cards for pre-declaring your situation, ensuring help is sent without visible interaction.

Discreet SOS alertsReal-time GPS location sharingAI Safety Check-ins

This app provides a quick way to contact emergency services with your location data. It connects directly with rescue professionals and supports both local and international emergency numbers, even working offline.

One-tap emergency callsAutomatic location transmissionWorks offline

DiveCore: Dive Computer

DiveCore: Dive Computer

DiveCore: Dive Computer

Safer dives, smarter insights

This app transforms your Apple Watch Ultra into a comprehensive dive computer, offering real-time decompression data, freediving modes, and estimated dive routes. It analyzes your dives with on-device AI and logs them automatically, with advanced photo editing for underwater shots.

Real-time decompression modelFreediving modes (CWT, STA, DYN)Estimated dive route tracking

by Royal Canadian Marine Search and Rescue

This app provides essential resources for boaters on Canada's West Coast. Plan voyages with tidal, wind, and weather data, and access safety equipment and navigation light requirements. It also offers tools for location sharing, emergency procedures, and radio channel summaries.

Voyage planning resourcesSafety equipment checklistsNavigation light requirements

The official NDL app

Confirm your diver or freediver status online and save electronic certificates offline. This app offers a free log-book and No-decompression limit planner, along with the latest news from the National Dive League. Professionals can also manage certificates and access the NDL Professional Zone.

Confirm diver status onlineSave electronic certificates offlineFree log-book

The best app for scuba diving

Discover detailed underwater routes and log your dives with this comprehensive scuba diving application. It offers a free logbook, educational tests, and a diving encyclopedia, all created by experienced divers.

Detailed underwater route mapsFree dive logbookDiving encyclopedia

nke display pro

nke display pro

nke display pro

by NKE Marine Electronics

View and control your boat's navigation data and autopilot system. Record navigation logs and diagnose instruments. Sync preferences across devices.

View boat navigation informationControl autopilot commandsRecord navigation data (NMEA 0183)

🗺️ Navigation

free with in-app purchases

Lighthouse Finder

Lighthouse Finder

Lighthouse Finder

List of Navigational Aids

🗺️ Navigation

Global Rescue GRID

Global Rescue GRID

Global Rescue GRID

by Global Rescue LLC

by Koninklijke Nederlandse Redding Maatschappij (KNRM)

This app helps maritime adventurers plan and track their journeys. It allows users to register vessels, file trip plans with estimated arrival times and emergency contacts, and activate real-time location tracking. It also provides access to nautical maps, weather information, and safety data.

Vessel registrationSail Plan mode for trip planningTrack only mode for real-time tracking

Into the Blue: Scuba Dive Log

Into the Blue: Scuba Dive Log

Into the Blue: Scuba Dive Log

Log dives & track marine life

GPS Coordinates - Location Pin

GPS Coordinates - Location Pin

GPS Coordinates - Location Pin

Fields Area Measure Boundaries

🗺️ Navigation

Nautical Info Service Croatia

Nautical Info Service Croatia

Nautical Info Service Croatia

by Ministarstvo pomorstva, prometa i infrastrukture

This free bilingual app provides essential information for anyone spending time on the Croatian coast and at sea. It offers weather forecasts, navigation rules, and contact details for public services, aiding in navigation safety and emergency situations.

Bilingual interfaceOfficial weather forecastsNavigation rules and information

Crisis Messenger

Crisis Messenger

Crisis Messenger

by CRISIS24 SAS

This app allows users to instantly transmit their GPS location and send pre-programmed or custom messages with an alert signal. It also enables direct calling to a chosen phone number, connecting users to a situation center.

Instant GPS position transmissionDirect calling to chosen numberPre-programmed and custom text messages

DragAlarm (Anchor guard)

DragAlarm (Anchor guard)

DragAlarm (Anchor guard)

This app monitors your boat's anchor to alert you if it's dragging. It calculates your swinging radius and displays your location, anchor position, and boat tracking on a map. Receive email alerts with detailed information if your anchor becomes unsecured.

Anchor dragging alertsGPS trackingSwinging radius calculation

🗺️ Navigation

by SRT Marine Systems plc

This app wirelessly connects to your em-trak AIS transceiver, allowing you to program, configure, and monitor its health. It helps optimize antenna performance and stream data to multiple navigation devices simultaneously.

Wireless connection to AIS transceiverProgram and configure transceiverMonitor transceiver health and performance

FAQ about Nautilus Lifeline

What are the best nautilus lifeline apps for iPhone?

Nautilus GPS tops our nautilus lifeline apps ranking as of October 2026, with a 1.9-star average from 12 App Store ratings, and it's free to download.

Are there free nautilus lifeline apps for iPhone?

Yes — 19 of the top nautilus lifeline apps we rank are free to download, including Nautilus GPS and LifeLine Support.

Does Nautilus GPS have ads or in-app purchases?

Nautilus GPS has no ads and has no in-app purchases, according to its App Store listing as of October 2026.

How many nautilus lifeline apps are on the App Store?

We track 250+ nautilus lifeline apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.