Comparison

WilhelmSK vs Sailing Master M

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

Head to head
About

WilhelmSK

This app provides a customizable dashboard for monitoring and controlling boat systems. It integrates with various marine electronics and offers features like alarm notifications, autopilot control, and chart display.

Highlights
  • Customizable display and monitoring dashboard
  • Integrates with Signal K Server and various marine devices
  • Autopilot control and monitoring
  • Active Captain Points of Interest display
  • Alarms and push notifications
  • Navionics chart display
  • Customizable gauges and layouts
Features
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WilhelmSK is a highly customizable display, monitoring and control dashboard for your boat. WilhelmSK works best wth Signal K Server . It can also connect directly to some devices: º NMEA 0183 over TCP or UDP. (from for example, Digital Yacht's Smart WLN10) º Any modern Navico (Lowrance, Simnet or B&G) GoFree MFDs º NMEA 2000 via Yacht Device's YDWG-02, YDEN º NMEA 2000 via Actisense W2k-1 or W2K-2 º Victron Venus GX or CCGX º Victron VRM º Chetco SeaSmart Devices º Chetco HelmSmart RayMarine and Simrad/B&G Auto Pilot Support (via node-server or the YDWG only, W2K-1) º View or change current mode º View current target heading or Wind direction º Change target heading or Wind direction Alarms and Notifications º View list of current current alarms º Push notification support * º Setup server side alarms * º Set an anchor alarm with the push of a button * Navionics Maps If you already have the Navionics Boating application with an active subscription, you can now use the same Navionics charts in WilhelmSK. Ensure you are a registered user with Navionics and have a Username and Password. If you have not registered, go to the Navionics Boating App’s Main Menu, click on the top “Me” option and then click Login. In WilhelmSK click the login button on the bottom right of the map and enter your Navionics login information. Features: - Raymarine MFD: display and interact with a RayMarine MFD (discovered via Bonjour) - Fusion stereo (control zone volumes, source input, play, pause etc.) - Create a gauge for any value available via SignalK - Sophisticated anchor alarm (requires node server and signalk-anchoralarm-plugin) - Customize gauge display using SignalK meta.zones - Customize gauge range, min/max, etc. - Save custom gauges to node server or the cloud for use on other devices - Wind Angle gauges can optionaly be rotated so that they always point ot the bow of the boat, regaurless of device positioning - Place gauges by long pressing on a gauge and choosing a differnt one - Make a gauge full screen by double tapping - Multiple layout support. Create a differnt layout for Steaming, Sailing, Home Monitoring, etc. - Customize the nuber of pages and their layout - Manuall connection configuration synced accross devices via iCloud - Automatic connection selection based on current ip (usefull when Bonjour is not available and you have multiple boats) - Two themes, dark and light - Animated gauge needles - iPad Slideover and Split View support (Your gauge configuration can be customized for these views) - Connections can be configured to be refreshed manually or at a specific time interval - Design your own custom gauge templates - Share your custom templates via Air Drop, eMail, Text, etc. - Edit ApplyTV or other device layouts and templates remotely using your iPhone or iPad - Most gauges can be configured to be digital or analog - Enter the SignalK path and title for any gauge to show data not supported by default - Displays AIS targets in the Map views - Configure node server plugins inside of the app - IP and RTSP camera display * Some advanced features require signalk-server-node and special plugins installed. Setup Instructions at https://github.com/sbender9/wilhelmsk-node-server-setup

About

Sailing Master M

This app provides comprehensive sailing data and performance optimization on various Apple devices. It displays over 35 sailing measurements from boat instruments, polars tables, and nautical charts, offering detailed wind, route, and map views. Connectivity is established through NMEA 0183 Wi-Fi gateways.

Highlights
  • Configurable data displays
  • 35+ sailing measurements
  • Wind, route, and map displays
  • NMEA 0183 Wi-Fi connectivity
  • Polars table integration
  • Nautical chart overlays
Features
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Sailing Master M offers comprehensive sailing data and performance optimization information on iPhones, iPads, iWatches, and ActiveLook smart glasses. The application provides configurable pages and data displays, utilizing over 35 sailing measurements from the boat’s instruments, polars tables, and nautical charts. On phones and pads, the Data and Analog Displays can include minimum and maximum values and time series graphs. The Wind Display provides wind, heading, route, and speed information. The Route Display shows the expected wind conditions on the next legs. The Map Display shows the vessel with direction, tacking and downwind laylines on a nautical chart, or the wind laylines in another location. The connectivity is through NMEA 0813 Wi-Fi gateways such as B&G Vulcan, Zeus, GoFree, Yacht Devices, Signal K, Actisense, and ShipModul. The application has evolved from its initial focus on NMEA data display to encompass a comprehensive suite of features. Consequently, the app’s name has been revised from 'Display0183M' to 'Sailing Master M'. For further information, please refer to the user’s guide available on the app’s website or within the app itself. Terms of use: The app is delivered under the Apple End User License Agreement (EULA, https://www.apple.com/legal/internet-services/itunes/dev/stdeula/) The following libraries and services are used: - Kitura/BlueSocket, published under the Apache 2.0 license - A modified version of GPX package, published under BSD 3-Clause License and copyrighted by Ioannis Silks - OpenStreetMap licensed under the Open Data Commons Open Database License (ODbL, https://opendatacommons.org/licenses/odbl/) by the OpenStreetMap Foundation Licence, and ©OpenStreetMap contributors. OpenSeaMap, which is licensed under the Open Data Commons (ODbL) license, and ©OpenSeaMap contributors The supported NMEA 0183 sentences are: - BWR: Bearing and distance to waypoint - DBS: Depth below surface - DBT: Depth below transducer. - DPT: depth of water. - CGA: Global Positioning System Fix data - GLL: Geographic position Latitude/Longitude - HDG: Heading magnetic - HDM: Heading magnetic - HDT: Heading true - MWD: undocumented, wind direction, wind speed - MTW: water temperature °C - MWV: Wind speed and angle (A,T) - RMB: XTE, range to destination, bearing to destination, destination closing velocity . - RMC: Speed over ground - RSA: Rudder sensor angle - VHW: Water speed and heading - VLW: Distance travelled through water - VPW: Speed - measured parallel to wind - VTG: Course over ground (T or M), speed over ground - VWR: Wind direction (A), wind speed (A) - WCV: Waypoint closure velocity - XDR: air temperature (°C), water temperature (°C) and barometric pressure (mbar). - XTE: Cross track error The data items from NMEA and polars are: - Waypoint bearing - Waypoint distance - Time to Waypoint - VMG waypoint - Cross track error - Depth - Heading - Heading - Course - Course - Water speed - Speed over ground - Water temperature - Air temperature - Air pressure - Wind speed apparent - Wind angle apparent - Wind speed true - Wind direction - Wind direction - VMG Wind - Latitude, Longitude - Waypoint laititude, longitude - Water Distance after reset - Total water distance - Ground distance after reset - Total ground distance - Velocity made good towards wind - Heel - Rudder - Boat target speed through the water - Boat speed of target speed (%) - Beat VMG boat target speed through the water - Run VMG boat target speed through the water - GPS based trip distance - Leeway

Screenshots

WilhelmSK4 screens
Sailing Master M4 screens

Verdict

The call

The clearest difference is price: Sailing Master M at Free against WilhelmSK's $19.99. Sailing Master M also leads on rating (5.0 vs 4.5). WilhelmSK's advantage is in-app purchases (none vs 1) and ratings volume (28 vs 1). On update cadence and ads 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

Sailing Master M is free to download; WilhelmSK costs $19.99 up front. Sailing Master M sells 1 in-app purchase, starting at $11.99 per year. WilhelmSK asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sailing Master M holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: WilhelmSK has 28 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 11, 2026 and September 9, 2026 respectively.

Scorecard7 real differences · 3 level
WilhelmSK versus Sailing Master M: the parameters behind the verdict, then further details
ParameterWilhelmSKSailing Master M
Price$19.99Free — better
Rating4.5 (28 ratings)5.0 (1 ratings) — better
Positive reviews80.0% of reviews
Number of ratings28 — better1
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod, Apple TV, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS13.0 — better17
Further details — not scored
Size118 MB26 MB
Age rating4+4+
DeveloperScott BenderPekka Leppanen

Customer experience

WilhelmSK

All ratings28 ratings
Positive89.3%
Neutral0.0%
Negative10.7%
Written reviews20 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Sailing Master M

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

WilhelmSK

No in-app purchases

1 purchases

Sailing Master M

Subscriptions1
  • Pro annual14 Days trial$11.991 Year

Questions

Is WilhelmSK free?
WilhelmSK costs $19.99, with no in-app purchases.
Is Sailing Master M free?
Sailing Master M is free to download, with in-app purchases available.
Which has better reviews, WilhelmSK or Sailing Master M?
Sailing Master M is rated higher. WilhelmSK averages 4.5 out of 5 from 28 ratings, while Sailing Master M averages 5.0 from 1 ratings.
Do WilhelmSK or Sailing Master M have ads?
Neither WilhelmSK nor Sailing Master M shows ads.
Which is updated more often, WilhelmSK or Sailing Master M?
WilhelmSK ships an update every 2 months, and Sailing Master M every 2 months. Most recently, WilhelmSK was updated on September 11, 2026 and Sailing Master M on September 9, 2026.

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