Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
NMEA Monitor is a powerful, easy-to-use tool to record and display a wealth of real-time information directly from NMEA or AIS WiFi devices such as the Vesper Marine XB8000
$3.99 · In-app purchases
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for NMEA Monitor: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Assumption to check: Limited user feedback on NMEA stream connectivity
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor UI for displaying real-time data
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of detailed settings customization
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Insufficient help and support resources
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
NMEA Monitor is a powerful, easy-to-use tool to record and display a wealth of real-time information directly from NMEA or AIS WiFi devices such as the Vesper Marine XB8000. Information is sourced in real-time directly from the connected AIS device and data is logged to a file on your device which you can view directly on your mobile device, or email to yourself for later data analyses and archiving. Information is also displayed and updated in real-time on the screen of your mobile device during the logging process. View, display and log a wide range of real-time measurements, including: GPS position Satellites in View Position error estimates GPS DOP and active satellites Track-made-good and ground speed Recommended minimum GPS data Received AIS data Received Wind data And many others With NMEA Monitor you can view, access and log all the NMEA sentences being broadcast from your AIS device. Use this data log to answer a wealth of questions including: exactly how fast is my ship? exactly where did my ship go? what is the average and maximum speed of my ship? how fast was the wind? maximum wind speed? direction? what are the polars for my boat? NMEA Monitor is very easy to use: Simply start and view your measurements with one touch of a button. NMEA Monitor does require that your iPhone or iPad be connected to the same wifi internet connection as your NMEA/AIS device. You do not need to know the exact IP address of your NMEA device as this app has AUTOSCAN capabilities. However you should know the default port number (or accept the default settings on the app for your AIS. The default for Vesper Marine XB8000 is 39150). NMEA Monitor communicates wirelessly with your AIS device. To use NMEA Monitor you need to own or have access to an NMEA device such as the Vesper Marine XB8000. All your NMEA data is stored strictly on your device only and never transmitted elsewhere. You own your data and you only have access to it. To get started, launch the app, select its Settings tab, and enter IP address of your AIS device (if known), and port number. If unknown, be sure to enable AUTOSCAN (on by default). You may disable the AUTOSCAN feature here if you know for certain the IP address of your NMEA device and are certain you do not need AUTOSCAN. In that case be sure to enter the correct IP address. Ensure your mobile device is connected to the same WiFi network as your NMEA device. Then from the "DISPLAY" module of the app, tap on the "CONNECT" button at the top right corner of the screen. Once you have selected CONNECT, the app will try to establish a connection with your NMEA device through the WiFi network. If AUTOSCAN is enabled, the app will methodically scan the network searching for an active NMEA device, and will connect to the first one it finds. If AUTOSCAN is disabled, the app will try only the IP address saved in the SETTINGS module, and give-up if no NMEA device is found there. It is recommended that you enable AUTOSCAN if you are unsure of the IP address of your NMEA device. With AUTOSCAN enabled, the first scan may take a few minutes. When the app scans and finds an NMEA device, it remembers its IP address, such that the next time you try to use the app it should connect much faster - almost instantaneously. The primary dash displays of the app will show all the transmitted NMEA sentences in real time, as well as stream the live raw data in the lower portion of the screen. All runs will automatically be logged and the raw log files will be available under the "Log Files" module of this app. You can view raw data from current and past log files from the "Log Files" module of this app. You can email these log files to yourself, or export them to your other apps. The log files are text-based comma-delimitted files (CSV), which you should be able to view with a wide variety of common apps or text editors. Ndili Technologies, Inc. has no affiliation to, and is not associated or sponsored by any AIS / NMEA company.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.