Update product URLs

Updated for SEO compatibility

Author: santaimpersonator

README.md

@@ -1,23 +1,23 @@
 SparkFun RTK Postcard
 ========================================
 
-[![SparkFun RTK Postcard](https://cdn.sparkfun.com/r/600-600/assets/parts/2/8/0/3/2/26916-RTK-Postcard-Feature.jpg)](https://www.sparkfun.com/products/26916)
+[![SparkFun RTK Postcard](https://cdn.sparkfun.com/r/600-600/assets/parts/2/8/0/3/2/26916-RTK-Postcard-Feature.jpg)](https://www.sparkfun.com/sparkfun-rtk-postcard.html)
 
-[*SparkFun RTK Postcard (GPS-26916)*](https://www.sparkfun.com/products/26916)
+[*SparkFun RTK Postcard (GPS-26916)*](https://www.sparkfun.com/sparkfun-rtk-postcard.html)
 
-Designed and manufactured in Boulder, CO USA, the [SparkFun RTK Postcard](https://www.sparkfun.com/products/26916) is a compact development board for your high-precision positioning and navigation needs. This board combines the Quectel LG290P GNSS RTK receiver with an Espressif ESP32-PICO-MINI-02 MCU module, running our latest [RTK Everywhere firmware](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware). The ESP32 provides the SparkFun Postcard with WiFi and Bluetooth™ connectivity to operate as an NTRIP caster or client. Meanwhile, the 4-pin locking JST-GH connector allows users to transmit or receive RTCMv3 messages for RTK corrections from a local base station.
+Designed and manufactured in Boulder, CO USA, the [SparkFun RTK Postcard](https://www.sparkfun.com/sparkfun-rtk-postcard.html) is a compact development board for your high-precision positioning and navigation needs. This board combines the Quectel LG290P GNSS RTK receiver with an Espressif ESP32-PICO-MINI-02 MCU module, running our latest [RTK Everywhere firmware](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware). The ESP32 provides the SparkFun Postcard with WiFi and Bluetooth™ connectivity to operate as an NTRIP caster or client. Meanwhile, the 4-pin locking JST-GH connector allows users to transmit or receive RTCMv3 messages for RTK corrections from a local base station.
 
 - The LG290P module is a quad-band, multi-constellation, high-precision, RTK GNSS receiver. The module can simultaneously receive signals from the `L1`, `L2`, `L5`, and `L6`/`E6` frequency bands of the GPS, GLONASS, Galileo, BDS, QZSS, and NavIC GNSS constellations. In addition, the module supports SBAS augmentation systems (WASS, EGNOS, BDSBAS, MSAS, GAGAN, and SDCM), PPP services* (BDS PPP-B2b, QZSS CLAS, MADOCA-PPP, and Galileo HAS), RTCM, and RTK corrections for precision navigation with a fast convergence time and reliable performance. Connect with ease using a variety of interfaces, including UART, SPI*, and I2C*. 
 
 - The ESP32-PICO-MINI-02 is a powerful MCU module with WiFi, Bluetooth™, and BLE connectivity and comes integrated with 8MB SPI flash, 2MB SPI Pseudo static RAM (PSRAM), and a 40 MHz crystal oscillator. The ESP32 microcontroller itself features two CPU cores that can be individually controlled, with an adjustable clock frequency between 80 - 240MHz and a low-power co-processor for minor tasks, such as monitoring peripherals. It supports a range of peripherals including an SD card interface, capacitive touch sensors, ADC, DAC, Two-Wire Automotive Interface (TWAI), Ethernet, high-speed SPI, UART, I2S, I2C, etc.
 
 With the [RTK Everywhere firmware](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware) that comes pre-loaded, users can seamlessly operate the RTK Postcard as a base station or rover. These modes also offer additional functions, based on the available, wireless communication options:
 
-- The RTK Postcard can transmit or receive RTCMv3 messages locally by connecting one of our [SiK Telemetry radios](https://www.sparkfun.com/products/19032).
+- The RTK Postcard can transmit or receive RTCMv3 messages locally by connecting one of our [SiK Telemetry radios](https://www.sparkfun.com/sik-telemetry-radio-v3-915mhz-100mw.html).
 - Through WiFi or Bluetooth™, the RTK Postcard can also function as an NTRIP caster or client.
 - The RTK Postcard can transmit NMEA messages to a [graphical information software (GIS)](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/gis_software_android/) apps on any mobile device when paired as a Bluetooth™ device.
 
-In addition to the RTK Postcard, we created the [Portability Shield](https://www.sparkfun.com/products/27510) for the convenience of users. Simply connecting these products, provides a 1.3” OLED display and a five-way button to navigate the configuration settings and display PNT data; a microSD card slot for data logging; and a LiPo battery charger with a fuel gauge to take the RTK Postcard *"on-the-go"*. All of these will operate plug-and-play without the need for new code.
+In addition to the RTK Postcard, we created the [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html) for the convenience of users. Simply connecting these products, provides a 1.3” OLED display and a five-way button to navigate the configuration settings and display PNT data; a microSD card slot for data logging; and a LiPo battery charger with a fuel gauge to take the RTK Postcard *"on-the-go"*. All of these will operate plug-and-play without the need for new code.
 
 > [!NOTE]
 > The [RTK Everywhere firmware](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware) is open-source, so users can obtain, check, and even modify the device's functionality. This allows for easier feature expansion, bug maintenance, and longer device longevity.
@@ -62,8 +62,8 @@ Repository Contents
 Product Variants
 ----------------
 
-* [GPS-26916](https://www.sparkfun.com/products/26916) - v1.0, Initial Release
-* [GPS-26620](https://www.sparkfun.com/products/26620) - SparkFun Quadband GNSS RTK Breakout - LG290P (Qwiic) *(w/o ESP32)*
+* [GPS-26916](https://www.sparkfun.com/sparkfun-rtk-postcard.html) - v1.0, Initial Release
+* [GPS-26620](https://www.sparkfun.com/sparkfun-quadband-gnss-rtk-breakout-lg290p-qwiic.html) - SparkFun Quadband GNSS RTK Breakout - LG290P (Qwiic) *(w/o ESP32)*
 
 Version History
 ---------------

docs/hardware_assembly.md

@@ -69,7 +69,7 @@ The JST connector on the Quad-band GNSS RTK board, breaks out the `UART3` port o
 <figure markdown>
 [![Device connected to the JST connector](./assets/img/hookup_guide/assembly-radio_setup.jpg){ width="400" }](./assets/img/hookup_guide/assembly-radio_setup.jpg "Click to enlarge")
 <figcaption markdown>
-The [Telemetry Radio v3](https://www.sparkfun.com/products/19032) connected to the RTK Postcard.
+The [Telemetry Radio v3](https://www.sparkfun.com/sik-telemetry-radio-v3-915mhz-100mw.html) connected to the RTK Postcard.
 </figcaption>
 </figure>
 
@@ -126,10 +126,10 @@ When connecting the RTK Postcard to other products, users should be aware of the
 
 
 ### Radio Transceivers
-We have designed the locking JST connector to be plug-n-play with the following devices and cables. However, for the [SiK Telemetry Radio v3](https://www.sparkfun.com/products/19032), users should [modify the `VSEL` jumper](../hardware_overview/#jumpers) (1) on the back of the board to enable a 5V output on the `VCC` pin. Below, is a table summarizing the pin connections of the radios.
+We have designed the locking JST connector to be plug-n-play with the following devices and cables. However, for the [SiK Telemetry Radio v3](https://www.sparkfun.com/sik-telemetry-radio-v3-915mhz-100mw.html), users should [modify the `VSEL` jumper](../hardware_overview/#jumpers) (1) on the back of the board to enable a 5V output on the `VCC` pin. Below, is a table summarizing the pin connections of the radios.
 { .annotate }
 
-1. While the [SiK Telemetry Radio v3](https://www.sparkfun.com/products/19032) may function with a **3.3V** input, their specifications stipulate that a **5V** power supply be provided.
+1. While the [SiK Telemetry Radio v3](https://www.sparkfun.com/sik-telemetry-radio-v3-915mhz-100mw.html) may function with a **3.3V** input, their specifications stipulate that a **5V** power supply be provided.
 
 <article style="text-align: center;" markdown>
 
@@ -240,7 +240,7 @@ We have designed the locking JST connector to be plug-n-play with the following
 
 	<div class="grid cards" markdown>
 
-	-   <a href="https://www.sparkfun.com/products/19032">
+	-   <a href="https://www.sparkfun.com/sik-telemetry-radio-v3-915mhz-100mw.html">
 		<figure markdown>
 		![Product Thumbnail](https://cdn.sparkfun.com/assets/parts/1/8/6/3/4/19032-SiK_Telemetry_Radio_V3_-_915MHz__100mW-01.jpg)
 		</figure>
@@ -250,7 +250,7 @@ We have designed the locking JST connector to be plug-n-play with the following
 		**SiK Telemetry Radio V3 - 915MHz, 100mW**<br>
 		WRL-19032</a>
 
-	-   <a href="https://www.sparkfun.com/products/20029">
+	-   <a href="https://www.sparkfun.com/sparkfun-loraserial-kit-915mhz-enclosed.html">
 		<figure markdown>
 		![Product Thumbnail](https://cdn.sparkfun.com/assets/parts/1/9/7/9/0/SparkFun_LoRaSerial_Enclosed_-_20029-1.jpg)
 		</figure>
@@ -260,7 +260,7 @@ We have designed the locking JST connector to be plug-n-play with the following
 		**SparkFun LoRaSerial Kit - 915MHz (Enclosed)**<br>
 		WRL-20029</a>
 
-	-   <a href="https://www.sparkfun.com/products/17239">
+	-   <a href="https://www.sparkfun.com/jst-ghr-04v-to-jst-ghr-06v-cable-1-25mm-pitch.html">
 		<figure markdown>
 		![Product Thumbnail](https://cdn.sparkfun.com/assets/parts/1/6/2/2/2/17239-GHR-04V-S_to_GHR-06V-S_Cable_-_150mm-01.jpg)
 		</figure>
@@ -270,7 +270,7 @@ We have designed the locking JST connector to be plug-n-play with the following
 		**JST-GHR-04V to JST-GHR-06V Cable - 1.25mm pitch**<br>
 		CAB-17239</a>
 
-	-   <a href="https://www.sparkfun.com/products/17854">
+	-   <a href="https://www.sparkfun.com/ghr-04v-s-to-ghr-06v-s-cable-100mm.html">
 		<figure markdown>
 		![Product Thumbnail](https://cdn.sparkfun.com/assets/parts/1/7/0/3/4/17854-GHR-04V-S_to_GHR-06V-S_Cable_-_50mm-01.jpg)
 		</figure>

docs/hardware_overview.md

@@ -3,7 +3,7 @@ icon: material/cog
 ---
 
 ## :material-folder-cog: Design Files
-The SparkFun RTK Postcard board's dimensions, pin layout, and connectors are similar to our very popular [SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic)](https://www.sparkfun.com/products/16481) and [SparkFun Quadband GNSS RTK Breakout - LG290P (Qwiic)](https://www.sparkfun.com/products/26620). The board features multiple UART ports, which are accessible through the USB-C connector, [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins, and 4-pin locking JST connector. Users can also interface with the board through the 19 [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins that are broken out around the edge of the board. For the GNSS antenna, an SMA antenna connector is provided on the edge of the board; additionally, users can rework the board to utilize the u.fl connector instead. We also provide two 4-pin JST Qwiic connectors for future use, to operate the board as a peripheral device.
+The SparkFun RTK Postcard board's dimensions, pin layout, and connectors are similar to our very popular [SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic)](https://www.sparkfun.com/sparkfun-gps-rtk-sma-breakout-zed-f9p-qwiic.html) and [SparkFun Quadband GNSS RTK Breakout - LG290P (Qwiic)](https://www.sparkfun.com/sparkfun-quadband-gnss-rtk-breakout-lg290p-qwiic.html). The board features multiple UART ports, which are accessible through the USB-C connector, [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins, and 4-pin locking JST connector. Users can also interface with the board through the 19 [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins that are broken out around the edge of the board. For the GNSS antenna, an SMA antenna connector is provided on the edge of the board; additionally, users can rework the board to utilize the u.fl connector instead. We also provide two 4-pin JST Qwiic connectors for future use, to operate the board as a peripheral device.
 
 
 <!-- Import the component -->
@@ -203,7 +203,7 @@ Below, is a general summary of the power circuitry for the board:
 
 - **`5V`** - The voltage from the USB-C connector, usually **5V**.
 	- Can be utilized as the primary power source for the entire board.
-	- When connected to the [Portability Shield](https://www.sparkfun.com/products/27510), this pin used to provide power between the boards. (1)
+	- When connected to the [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html), this pin used to provide power between the boards. (1)
 - **`3V3`** - 3.3V power rail, which powers the ESP32 Pico-Mini module, LG290P GNSS module, backup battery, and LEDs.
 	- Power can also be distributed to/from any of the JST connectors *(Qwiic or `UART3`)* or the `3V3` PTH pin.
 		- For power that is supplied through these connections, the LG290P has the tightest voltage supply requirement of **3.15–3.45V**.
@@ -256,7 +256,7 @@ Below, is a general summary of the power circuitry for the board:
 	For more details, users can reference the [schematic](./assets/board_files/schematic.pdf) and the datasheets of the individual components on the board.
 
 !!! tip "Portability Shield"
-	When used in conjunction with the [Portability Shield](https://www.sparkfun.com/products/27510), users should be aware of the following:
+	When used in conjunction with the [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html), users should be aware of the following:
 
 	- To charge the battery, users must provide adequate power through the `5V` pin. This is most easily done by powering the boards from the USB-C connector.
 	- When operating the boards with the battery power, users must ensure that the switch behind the OLED display is in the `On` position. This will allow the battery power to feedback to the RTK Postcard through the `5V` pin; and over to the RT9080 LDO to provide a regulated 3.3V to its primary components.
@@ -357,7 +357,7 @@ The ESP32 Pico-Mini module on the RTK Postcard.
 
 
 ### Peripherals and I/O Pins
-The ESP32 Pico-Mini module features *27 multifunctional GPIO* pins, of which, **11 I/O pins** broken out into [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins on the RTK Postcard. Meanwhile, others are utilized to interface with the LG290P GNSS receiver or other components on the board *(i.e. USB connector, Qwiic connector, etc.)*. All of the RTK Postcard [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins have a .1" pitch spacing for standard headers and their pin layout is compatible with our [Portability Shield](https://www.sparkfun.com/products/27510).
+The ESP32 Pico-Mini module features *27 multifunctional GPIO* pins, of which, **11 I/O pins** broken out into [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins on the RTK Postcard. Meanwhile, others are utilized to interface with the LG290P GNSS receiver or other components on the board *(i.e. USB connector, Qwiic connector, etc.)*. All of the RTK Postcard [PTH](https://en.wikipedia.org/wiki/Through-hole_technology "Plated Through Holes") pins have a .1" pitch spacing for standard headers and their pin layout is compatible with our [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html).
 
 
 <div class="grid" markdown>
@@ -1371,10 +1371,10 @@ The u.fl connector for the **[PPS output](#pps-output)** from the RTK Postcard.
 
 
 ## JST Connector
-The RTK Postcard features a 4-pin [JST GH connector](./assets/component_documentation/JST-GH_datasheet.pdf), which is polarized and locking. Users can access the pins of the `UART3` port, through the JST connector with our [breadboard cable](https://www.sparkfun.com/products/17240)(1) or through the PTH pins. The pin layout of the JST connector is compatible with many of our [serial radios and adapter cables](../hardware_assembly/#radio-transceivers).
+The RTK Postcard features a 4-pin [JST GH connector](./assets/component_documentation/JST-GH_datasheet.pdf), which is polarized and locking. Users can access the pins of the `UART3` port, through the JST connector with our [breadboard cable](https://www.sparkfun.com/breadboard-to-jst-ghr-04v-cable-4-pin-x-1-25mm-pitch.html)(1) or through the PTH pins. The pin layout of the JST connector is compatible with many of our [serial radios and adapter cables](../hardware_assembly/#radio-transceivers).
 { .annotate }
 
-1. <a href="https://www.sparkfun.com/products/17240">
+1. <a href="https://www.sparkfun.com/breadboard-to-jst-ghr-04v-cable-4-pin-x-1-25mm-pitch.html">
 	<figure markdown>
 	![Product Thumbnail](https://cdn.sparkfun.com/assets/parts/1/6/2/2/3/17240-Breadboard_to_GHR-04V-S_Cable_-_150mm-01.jpg){ width="300" }
 	</figure>
@@ -1565,7 +1565,7 @@ The jumpers on the back of the RTK Postcard.
 - **`I2C-EXT`** - This jumper can be cut to disconnect the pull-up resistors on the `SCL_1` and `SDA_1` connections of the Qwiic connectors.
 - **`SHLD`** - This jumper can be cut to disconnect the shielding of the USB-C connector from the `GND` plane of the board
 - **`VSEL`** - This jumper can be modified to configure/disconnect the `VCC` pin of the 4-pin locking JST connector to/from `3V3` or `5V` power rails.
-	- Users should also keep in mind that connecting the jumper to the `5V` power rail, could include the voltage provided by the LiPo battery from the [Portability Shield](https://www.sparkfun.com/products/27510).
+	- Users should also keep in mind that connecting the jumper to the `5V` power rail, could include the voltage provided by the LiPo battery from the [Portability Shield](https://www.sparkfun.com/sparkfun-portability-shield.html).
 - **`STAT`** - This jumper can be cut to remove power from the green LED, indicating the operational status for the [RTK Everywhere firmware](https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware).
 - **`PWR`** - This jumper can be cut to remove power from the red, power LED.
 - **`PPS`** - This jumper can be cut to remove power from the yellow LED, which is connected to the [PPS](https://en.wikipedia.org/wiki/Pulse-per-second_signal "Pulse Per Second") signal.