Comparison

SailTimer™ vs NavLink HD

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

Head to head
About

SailTimer™

Visualize wind and wave conditions before you head out on the water with this marine weather app. It uses crowdsourced data for more accurate, real-time forecasts than traditional satellite imagery. Track your GPS, create waypoints, and access offline charts for any boat type.

Highlights
  • Crowdsourced wind and wave map animation
  • Route viewing with aerial photos and land maps
  • Waypoint creation and GPS track saving
  • Offline map and chart usage
  • Follow-Me GPS tracking
  • Optimal tacking distance calculation for sailboats
Features
Read full description

For all types of boats. Beautiful marine weather animations: • Crowdsourced wind maps for the most accuracy and highest resolution. • Marine weather forecasts from Weathernews Inc. (WNI) with maps of precipitation, visibility, air & sea temperature, wind, waves/swell & ocean currents. • AI models of ocean currents and marine weather from Amphitrite. There are lots of weather services and apps, but they all use the same satellite weather forecast. Low resolution, low accuracy, and only updated 4 times per day. Weather satellites are 500 to 22,000 miles up in space. Crowdsourcing is changing marine weather. Why rely on satellite imaging, when you can use actual measurements from other boaters? In coastal areas, we archive these to map wind flow for more accuracy. Crowdsourced weather maps like these have never been possible before. A wind sensor measures local wind around your boat, but now you can also know the wind and sea state up ahead or around the next point. FEATURES FOR ALL TYPES OF BOATS: • View your route with free aerial photos and land maps worldwide. If you have the Navionics Boating app, you can import worldwide Navionics charts here with a yearly subscription. • The weather map animations each have low-cost monthly/yearly subscriptions with a free 7-day trial. • Hourly weather tables for crowdsourced wind and WeatherNews Inc. (WNI) weather maps. Tap on a certain hour to move the weather animation to that time. • Create and rename waypoints by tapping or importing a list. Save, import or email your GPS track. • All maps and charts in the app can be used offline. • The white crosshair icon in the top left is the “Follow-Me” button. If tapped, it turns blue and keeps your location in the center of the screen as you move. Unselect when not moving to look around the map. • Your device will not go to sleep when the app is open, to allow you to continue to monitor your progress on the chart. You can also continue to track your movement with the app running in the background or when the device is asleep (unless you hard-quit). (Note: Continued use of GPS running in the background can dramatically decrease battery life. This app may use your location even when it isn’t open, which can decrease device battery life.) FOR SAILBOATS: Whether cruising or racing, it is important to be able to determine the best heading on all points of sail. GPS chartplotters do not calculate tacking distances. But if they do not know the distance you will travel, how can they calculate your correct ETA? This is the only product that calculates your optimal tacks using your tacking distance and polar plots. Details at www.SailTimerApp.com. The SailTimer app gives you a quick and easy display of your optimal tacks and TTD® (Tacking Time to Destination). • Use our wireless Wind Instrument or wired Ultrasonic (www.SailTimer.co) to see wind direction, angle & speed. Enter a waypoint and your optimal tacks will update automatically as the wind changes. • Bring in wind data from any other wind sensor on wifi from NMEA 2000 or 0183, using our low-cost Air Link™ (https://wi-rb.com/airlink). • Custom polar plots: When using a wind sensor, the app can learn your sailboat's unique speed profile on all points of sail, for the most accurate tacking results. • Switch the display to the port or starboard tack to avoid obstructions, or let the app automatically display the tack nearest to your current heading. • Audio Navigation: when using the wireless Wind Instrument, optionally hear wind conditions or boat speed when they change by more than a set amount. • Convert from Apparent to True wind direction, angle & speed. See our channel on Tiktok and YouTube for more background.

About

NavLink HD

Transform your Apple device into a comprehensive chart plotter for marine navigation. Access real-time GPS, AIS overlays, and route planning tools. Unlock advanced features like live internet AIS feeds and augmented reality through in-app purchases.

Highlights
  • Real-time GPS plotting
  • Live AIS ship overlay
  • Waypoint and route planning
  • NMEA instrument gauges
  • Augmented Reality HorizonView
  • S57 digital mapping
Features
Read full description

Marine Navigation App that turns your Apple Device in to a full function chart plotter. Includes all our navigation, AIS and NMEA instrument and trip planning tools. A catalog of high resolution vector charts providing coverage across US including US Great Lakes, CA, UK & Ireland, Germany, France, Netherlands, Belgium, Denmark, Croatia and Spain are available via separate In App Purchases. Free features include: · Realtime GPS position plotted on the map · Live AIS ship overlay when connected to compatible wireless AIS system via a wireless NMEA link with CPA and TCPA alarms · NMEA Wind Speed and Direction gauges · Waypoints and routes with full route editing and planning function · Position, COG, SOG, VMG, bearing, distance and ETA displays · Weather buoy data · A-B chart ruler for quick and easy bearing and distance measurement · Favourite Place markers (POIs). Additional features available via In App Purchase subscription · Marine Charts - Yearly subscriptions for charts using the latest Hydrographic Office data including automatic updates for a year. · NavLink Pro - provides live internet AIS feeds for your area and an Augmented Reality HorizonView showing course, route, navaids, AIS targets, POIs and Air Draught on the camera display that makes Nav-Aid and vessel identification simple and reliable. Plan and sail routes Instant route and waypoint creation by tapping on screen. Route reverse function and route overview with inter-leg bearing and distance. Share your routes via dropbox and email with other users NavLink Charting NavLink utilises the latest S57 based digital mapping and features automatic updates for each year's subscription. With vector mapping, you can manage your layers of data to de-clutter the screen or maximise information. NavLink supports all key charting feature such as buoys, lights, bridges, depth contours, spot depths, depth contours, anchorage and military areas etc. Interfacing NavLink is compatible with all Digital Yacht's wireless NMEA devices such as the iAIS, WLN10, WLN10HS, NavLink, iNavHub and PilotLink that stream wireless AIS data to your Apple device If you have a WiFi-only iPad you will need an external Bluetooth GPS receiver to enable navigation. 3rd Party units are available such as the Garmin Glo. Please note: Continued use of GPS running in the background can dramatically decrease battery life Subscriptions Our in-app purchases are 1 year subscriptions, which automatically renew at the end of the subscription period unless auto-renew is turned off at least 24-hours before the end of the current period. Payment will be charged to your iTunes Account at confirmation of purchase, and will be charged for renewal within 24-hours prior to the end of the current period. Subscriptions may be managed by the iTunes account holder and auto-renewal may be turned off by going to Account Settings after purchase. 
No cancellation of the current subscription is allowed during active subscription period. Our privacy policy and terms and conditions may be viewed here:- http://seanav.net/digitalyacht/privacy.php and here :- http://seanav.net/dyiostsandcs.php Safety Notice NavLink (including the NOAA charts) is intended to be used as an aid to navigation. Only official government charts and notice to mariners contain all of the current information needed for safe navigation. This product's features cannot be relied on to be complete or accurate and may vary locally. It is the Captain's or Boat Owner's responsibility to use official government charts, notice to mariners, caution, sound judgement and proper navigational skill when operating their vessel and using this or any other Digital Yacht product. By purchasing this App, you are accepting the limitations of this app and the charts.

Screenshots

SailTimer™4 screens
NavLink HD4 screens

Verdict

The call

The clearest difference is review sentiment: SailTimer™ at 37% against NavLink HD's 0%. SailTimer™ also leads on update cadence (every 2 months vs every 5 months). NavLink HD's advantage is iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SailTimer™ sells 12 in-app purchases, starting at $2.99 per month and NavLink HD sells 11 in-app purchases, starting at $8.49 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SailTimer™ ships an update every 2 months, NavLink HD every 5 months. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
SailTimer™ versus NavLink HD: the parameters behind the verdict, then further details
ParameterSailTimer™NavLink HD
PriceFreeFree
Rating—4.2 (11 ratings) — better
Positive reviews37.0% of reviews — better0.0% of reviews
Number of ratings—11 — better
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.011.0 — better
Further details — not scored
Size126 MB52 MB
Age rating4+4+
DeveloperSailTimer Inc.DigitalYacht Ltd.

Customer experience

SailTimer™

Written reviews27 reviews
Positive37.0%
Neutral0.0%
Negative63.0%

NavLink HD

All ratings11 ratings
Positive81.8%
Neutral0.0%
Negative18.2%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

12 purchases

SailTimer™

Subscriptions3
  • WNI Marine Weather Map7 Days trial$2.991 Month
  • Wind Animation7 Days trial$2.991 Month
  • Navionics Charts$10.991 Year
One-time9
  • ActiveCaptainFree
  • Polar Plot LearningFree
  • Import NMEA data$0.99
Show 6 more
  • SailTimer Pro Bundle$7.99
  • USA Atlantic Coast$15.99
  • USA Pacific Coast$15.99
  • USA Great Lakes$15.99
  • USA Gulf Coast$15.99
  • Cuba, Bahamas, Puerto Rico and US Virgin Islands$15.99
11 purchases

NavLink HD

Subscriptions11
  • Weather charts$8.491 Year
  • Pro Features$16.491 Year
  • German Charts$16.991 Year
Show 8 more
  • NL & BE Charts$17.991 Year
  • US & Great Lakes$19.991 Year
  • Portuguese charts$19.991 Year
  • French Charts$22.991 Year
  • Spanish Charts$24.991 Year
  • Croatia charts$28.991 Year
  • Canadian Charts$30.991 Year
  • Danish Charts$36.991 Year

Questions

Is SailTimer™ free?
SailTimer™ is free to download, with in-app purchases available.
Is NavLink HD free?
NavLink HD is free to download, with in-app purchases available.
Do SailTimer™ or NavLink HD have ads?
Neither SailTimer™ nor NavLink HD shows ads.
Which is updated more often, SailTimer™ or NavLink HD?
SailTimer™ ships an update every 2 months, and NavLink HD every 5 months. Most recently, SailTimer™ was updated on October 12, 2026 and NavLink HD on October 3, 2026.

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