版本：1.0
更新日期：2026年8月13日
适用应用：汐·迹
1. 汐·迹是什么
汐·迹是一款面向 iPhone 的 GPS 与传感器仪表工具。你可以用它查看实时速度、配速、海拔、航向、GPS 状态、运动传感器状态，免费保存轨迹记录、查看历史，并在 Pro 功能中导出数据文件、连接蓝牙心率设备或进行加密备份。
汐·迹的核心原则是：离线可用、隐私优先、无广告、仅本地存储。
2. 巡航与记录的区别
汐·迹将“巡航”和“记录”分开：
| 功能 |
巡航 |
记录 |
| 用途 |
查看实时状态 |
保存完整轨迹和统计 |
| 是否保存历史 |
否 |
是 |
| 是否生成导出文件 |
否 |
可导出 |
| 是否需要 Pro |
否 |
否 |
| 适合场景 |
临时看速度、海拔、航向和移动状态 |
保存各模式轨迹和统计 |
巡航模式下，App 可能在当前会话中临时显示轨迹线，用于帮助你理解当前位置和移动方向。退出巡航后，这些临时轨迹不会进入历史记录，也不会用于导出。
3. 支持的使用场景
汐·迹支持多种模式，可按场景切换仪表和记录口径：
- 跑步：查看配速、距离、时长、步频、路线和心率。连接蓝牙心率带后，可作为不佩戴运动手表时的手机端运动仪表参考。
- 徒步：查看距离、海拔、速度、路线、移动状态和心率。连接蓝牙心率带后，可记录更完整的徒步强度变化。
- 登山：查看海拔、爬升、坡度、路线、垂直速度和心率。连接蓝牙心率带后，可辅助观察爬升过程中的身体负荷。
- 骑行：将 iPhone 作为轻量码表使用，查看实时速度、距离、均速、最高速度、海拔、爬升、坡度和航向；连接兼容外设后，可显示心率、踏频、功率或外置速度。
- 日常出行：查看速度、距离、时长、步数、步频和当前位置，用于普通移动状态参考。
- 汽车 / 摩托车：以 HUD / 码表风格查看速度、距离、航向、海拔和路线，仅供个人记录与参考。
- 船舶：查看水上航行速度、距离、时长、均速、最高速度、航向和轨迹；可辅助关注 GPS、速度和航向精度，仅供个人记录与参考，不作为专业航海导航或安全设备。
- 火车 / 大巴：查看速度、距离、时长和当前位置，适合长途出行记录。
- 飞行：在航空公司、机组和当地规定允许使用手机的情况下，可查看或记录飞行中的地速、高度、航向和轨迹。请全程遵守飞行模式、机上设备使用要求和机组指示，不要将汐·迹作为航空导航或安全设备使用。
不同设备、系统权限、GPS 信号环境和外设状态会影响可显示的数据。
4. 权限说明
汐·迹可能请求以下系统权限：
| 权限 |
用途 |
| 定位 |
展示实时速度、海拔、航向、位置、路线预览和轨迹记录 |
| 后台定位 |
在用户主动开启巡航或记录后，支持后台状态恢复和记录连续性 |
| 蓝牙 |
连接标准 BLE 心率带、心率臂带等外设 |
| 运动与健身 |
展示步数、步频、运动状态等 iPhone 内置传感器数据 |
| 文件 / 分享 |
用户主动导出 GPX、CSV、FIT、XLSX 等文件时使用 |
如果拒绝某些权限，对应功能可能不可用或数据不完整。你可以在 iOS“设置”中随时修改权限。
5. Pro 功能
记录、历史查看和路线回放免费可用。Pro 功能墙当前列出的 Pro 专属能力包括：
- 导出 GPX / CSV / FIT / XLSX。
- 连接标准 BLE 心率设备。
- 创建加密的
.xtbackup 全量备份，并从备份增量还原记录。
具体可用功能以 App 内购买页和当前版本说明为准。购买、恢复购买和退款由 Apple App Store 的应用内购买系统处理。
数据备份与还原
备份会包含本机完整数据库和 Artifacts 文件，并以你设置的密码加密为 .xtbackup 文件。密码至少 8 位，汐·迹不会保存密码；遗忘后无法打开备份。
还原只导入本机尚不存在的记录；若备份和本机存在相同 UUID 的记录，将保留本机记录，不会覆盖。备份与还原均在本机完成；你选择通过系统分享、文件 App、AirDrop 或云盘保存备份后，该服务对文件的处理受其自身规则约束。
6. 数据保存与导出
汐·迹仅将轨迹、传感器样本、导出记录和设置保存在你的设备本地。只有当你主动导出、分享或备份文件时，相关文件才会离开设备。
导出文件可能包含时间、经纬度、速度、海拔、航向、心率和运动传感器数据。请谨慎分享导出文件，避免暴露家庭住址、工作地点、旅行路线等敏感信息。
7. 数据准确性说明
汐·迹展示的数据来自 iPhone GPS / GNSS、CoreMotion、蓝牙外设和系统传感器。以下情况可能影响数据准确性：
- 室内、隧道、机舱、车厢、城市高楼或山谷等弱 GPS 环境。
- 系统省电策略、后台限制或权限变化。
- 蓝牙外设断连、电量不足或设备协议不标准。
- 飞行、高铁等高速移动场景下的定位采样差异。
对于短暂的数据缺失，汐·迹可能采用线性插值维持时间线连续性；插值结果仅为估算，不保证与实际测量完全一致。汐·迹不替代专业航行、医疗、救援或安全设备。
8. 常见问题
为什么巡航后没有历史记录？
巡航只用于查看实时状态，不保存历史。需要保存轨迹时，请使用记录功能。
为什么后台记录中断？
iOS 可能因权限、低电量、系统资源、用户手动关闭 App 或定位状态变化而中断后台能力。请确认已允许定位、后台定位，并保持设备电量充足。
为什么心率设备无法连接？
请确认设备支持标准 BLE Heart Rate Service，设备电量充足，且未被其它 App 占用。部分私有协议手环可能不被支持。
为什么速度或海拔不稳定？
GPS 信号和传感器环境会影响实时数据。建议在开阔区域使用，并等待 GPS 状态稳定后再开始记录。
9. 联系与支持
如需反馈问题、查看支持方式或联系开发者，请以 App Store 产品页展示的信息为准。反馈问题时，建议说明设备型号、iOS 版本、App 版本、使用模式、权限状态和问题发生时间。
Version: 1.0
Updated: August 13, 2026
App: Xi·Track
1. What Xi·Track Does
Xi·Track is a GPS and sensor dashboard for iPhone. It helps you view live speed, pace, altitude, heading, GPS status, motion status, save track records and review history for free, and, with Pro features, export data files, connect Bluetooth heart-rate devices, or create encrypted backups.
Xi·Track is built around offline use, privacy-first design, no ads, and local-first storage.
2. Cruise vs. Recording
Xi·Track separates “Cruise” from “Recording”:
| Feature |
Cruise |
Recording |
| Purpose |
View live status |
Save a complete track and statistics |
| Saves history |
No |
Yes |
| Exports files |
No |
Yes |
| Requires Pro |
No |
No |
| Best for |
Checking speed, altitude, heading, and movement status |
Saving tracks and statistics across modes |
During Cruise, the app may temporarily show a track line for the current session to help you understand your current position and direction. After you exit Cruise, this temporary track is not saved to history and cannot be exported.
3. Supported Scenarios
Xi·Track supports multiple modes with mode-specific dashboards and recording behavior:
- Running: view pace, distance, duration, cadence, route, and heart rate. With a Bluetooth heart-rate strap, it can act as an iPhone-based workout dashboard when you are not wearing a sports watch.
- Hiking: view distance, altitude, speed, route, movement status, and heart rate. With a Bluetooth heart-rate strap, it can record more complete intensity changes during hikes.
- Mountaineering: view altitude, ascent, grade, route, vertical speed, and heart rate. With a Bluetooth heart-rate strap, it can help you monitor effort during climbs.
- Cycling: use iPhone as a lightweight bike computer for live speed, distance, average speed, max speed, altitude, ascent, grade, and heading. With compatible accessories, it can show heart rate, cadence, power, or external speed.
- Daily travel: view speed, distance, duration, steps, cadence, and current location for everyday movement reference.
- Car / motorcycle: view speed, distance, heading, altitude, and route in a HUD / speedometer style for personal record keeping and reference only.
- Boat: view on-water speed, distance, duration, average speed, max speed, heading, and track lines. It can help you monitor GPS, speed, and course accuracy for personal records and reference only, and is not a professional marine navigation or safety device.
- Train / coach: view speed, distance, duration, and current location for long-distance travel records.
- Flight: when airline, crew, and local rules allow phone use, you can view or record in-flight ground speed, altitude, heading, and track lines. Always follow airplane mode requirements, onboard device-use rules, and crew instructions. Do not use Xi·Track as aviation navigation or safety equipment.
Available data may vary depending on the device, system permissions, GPS signal, and connected accessories.
4. Permissions
Xi·Track may request the following system permissions:
| Permission |
Purpose |
| Location |
Live speed, altitude, heading, position, route preview, and track recording |
| Background location |
Lock-screen/background status and recording continuity after you start Cruise or Recording |
| Bluetooth |
Connect standard BLE heart-rate straps, armbands, and related devices |
| Motion & Fitness |
Show steps, cadence, movement status, and iPhone sensor data |
| Files / Sharing |
Export GPX, CSV, FIT, XLSX, and other files when you choose to share them |
If you deny a permission, related features may be unavailable or incomplete. You can change permissions at any time in iOS Settings.
5. Pro Features
Recording, history, and route playback are available for free. The Pro feature wall currently lists these Pro-only capabilities:
- Exporting GPX / CSV / FIT / XLSX files.
- Connecting standard BLE heart-rate devices.
- Creating encrypted full
.xtbackup backups and incrementally restoring records from them.
Exact availability depends on the in-app purchase page and the current app version. Purchases, purchase restoration, and refunds are handled by Apple App Store in-app purchase systems.
Backup and Restore
A backup contains the complete local database and Artifacts files, encrypted into a .xtbackup archive using the password you set. Passwords must be at least 8 characters. Xi·Track does not retain the password, and a forgotten password cannot open the backup.
Restore imports only records that are not already on this device. If a backup and the device contain records with the same UUID, the local record is retained and is never overwritten. Backup and restore run locally; once you save or share a backup through the system share sheet, Files, AirDrop, or a cloud drive, that service handles the file under its own rules.
6. Data Storage and Export
Xi·Track stores tracks, sensor samples, export records, and settings only on your device. Related files leave the device only when you choose to export, share, or back them up.
Exported files may include timestamps, coordinates, speed, altitude, heading, heart rate, and motion sensor data. Please share exported files carefully because they may reveal sensitive places such as your home, workplace, or travel routes.
7. Data Accuracy
Xi·Track displays data from iPhone GPS / GNSS, CoreMotion, Bluetooth accessories, and system sensors. Accuracy may be affected by:
- Weak GPS environments such as indoors, tunnels, aircraft cabins, train cars, dense cities, or valleys.
- System power-saving behavior, background limits, or permission changes.
- Bluetooth disconnection, low accessory battery, or non-standard device protocols.
- Sampling differences during high-speed movement such as flights or high-speed trains.
For brief data gaps, Xi·Track may use linear interpolation to keep the timeline continuous. Interpolated values are estimates and may not exactly match actual measurements. Xi·Track is not a replacement for professional navigation, medical, rescue, or safety equipment.
8. FAQ
Why is there no history after Cruise?
Cruise is for viewing live status only. It does not save history. Use Recording when you want to save a track.
Why did background recording stop?
iOS may limit background behavior because of permissions, low battery, system resources, force quitting the app, or location status changes. Make sure location and background location permissions are enabled and your device has enough battery.
Why can’t my heart-rate device connect?
Make sure the device supports the standard BLE Heart Rate Service, has enough battery, and is not already connected to another app. Some proprietary fitness bands may not be supported.
Why are speed or altitude unstable?
GPS signal and sensor conditions can affect live data. For best results, use the app in open areas and wait for GPS status to stabilize before starting a recording.
9. Contact and Support
For support options or developer contact information, please refer to the App Store product page. When reporting an issue, include your device model, iOS version, app version, mode, permission status, and the time the issue occurred.