Why Updates Matter
Fish finder manufacturers release software updates that fix bugs, add features, improve sonar processing, and enhance chart data. Keeping your unit's software current ensures you get the best possible imaging quality and access to new capabilities. Map updates are equally important — lake and coastal contour data improves as more survey data becomes available, and community-sourced corrections fix errors in older charts.
Failing to update can leave you with known bugs, missing features that newer users enjoy, and outdated maps that misrepresent bottom contours or navigation hazards. Most updates are free and take 15–30 minutes to install.
Garmin Update Process
- Download the Garmin Express desktop app (free) at garmin.com/express
- Connect your fish finder to your computer via USB or remove the microSD card and use a card reader
- Garmin Express detects the unit and shows available software and map updates
- Follow the prompts to download and install — do not disconnect during the update
- For WiFi-enabled units (ECHOMAP Ultra, GPSMAP), updates can be downloaded directly via the ActiveCaptain app on your phone
- Quickdraw community maps can be downloaded via the ActiveCaptain app and transferred to the unit via microSD
Lowrance Update Process
- Register your unit at lowrance.com and access the Software Updates page
- Download the update file to a microSD card formatted FAT32
- Insert the card into your powered-on Lowrance unit
- Navigate to Settings → Software → Check for Updates and follow the prompts
- For units with WiFi (HDS PRO, HDS Live), updates can be pushed directly via WiFi in some regions
- C-MAP chart updates require a separate download from the C-MAP website or app
Humminbird Update Process
- Register your unit at humminbird.com and access My Equipment
- Download the software update file and copy it to a microSD card
- Insert the card, power on the unit, and the update installs automatically on boot
- LakeMaster map updates require purchasing the latest LakeMaster card for your region
- AutoChart Live recordings can be exported and shared via microSD for custom map building
Important
Always back up your waypoints and custom settings before performing a software update. While updates rarely cause data loss, having a backup on a separate microSD card eliminates risk.
Map Updates vs Software Updates
| Update Type | What It Changes | How Often | Cost |
|---|---|---|---|
| Software / Firmware | Bug fixes, new features, sonar processing improvements | 2–4 times per year | Free |
| Built-in Map Updates | Contour corrections, new survey data, community edits | Varies by platform | Free (Navionics daily via WiFi) or paid (annual) |
| Premium Map Cards | Regional high-resolution charts (LakeMaster, LakeVü, C-MAP) | Annual releases | Paid ($$ per region) |
Key Takeaway
Check for software updates at the start of each fishing season and whenever you notice performance issues. Map updates are especially valuable for anglers fishing new waters where contour accuracy matters for finding structure.
Frequently Asked Questions
How often should I update my fish finder?
Check for updates at least twice a year — before fishing season and mid-season. Software updates are free, take minutes to install, and often include meaningful improvements to sonar processing and feature additions.