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Jeffrey PerkinsJul 31, 2025
What to do if Simrad CP42 position is not updating?
- NNicole AguirreJul 31, 2025
If you are experiencing no GPS position update on your Simrad device, replace the antenna or cable.

What to do if Simrad CP42 position is not updating?
If you are experiencing no GPS position update on your Simrad device, replace the antenna or cable.
How to fix a Simrad CP42 when there is no picture on the display screen?
If there is no picture on the Simrad GPS display screen, first press the [PWR] key on the keypad. If that doesn't work, replace the fuse, ensuring you use only type F6.3A.
Why does my Simrad CP42 delete all data after turning it off and on?
If all data is deleted after turning your Simrad GPS unit off and on, it's likely due to the internal battery's lifetime, which is typically 3-5 years. In this case, the internal battery must be replaced by an authorized dealer.
How to adjust brightness on Simrad CP42 GPS?
If the picture on the Simrad GPS display screen appears, but the image is too dark or too bright, adjust the image as desired by pressing the [PWR] key, adjust light/contrast, and then press the [ENT] key.
What to do if Simrad CP42 GPS has no normal picture or key operation?
If your Simrad GPS has no normal picture or key operation, try the following steps: * Turn the unit off and on again. * Remove the C-MAP chart if you suspect it's defective. * Disconnect the power and then reconnect it.
Why is my Simrad GPS screen update extremely slow?
If the screen update on your Simrad GPS is extremely slow, turn off 'Course line' in the 'Edit route' display for each stored route, and turn off 'Display track' in the 'Track' display.
| Display Type | TFT LCD |
|---|---|
| Waterproof Rating | IPX6 |
| Channels | Up to 72 |
| Update Rate | 10 Hz |
| Humidity | 95% non-condensing |
| Enclosure Rating | IPX6 |
| Type | Chartplotter |
| Heading Resolution | 0.1° |
| Roll/Pitch Resolution | 0.1° |
| Roll/Pitch Accuracy | 1 degree |
| Operating Temperature | -15°C to +55°C |
| Interface | NMEA 2000, NMEA 0183, Ethernet |
Details how to use the GOTO function for navigation modes.
Explains how to plot new data like waypoints, routes, and lines.
Guides on saving data from the unit to a DataCard.
Details how to load data from a DataCard back into the unit.
Explains how to connect the unit to a power source.
Emphasizes using the correct fuse for unit protection.
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